diff --git a/py/services/model_file_service.py b/py/services/model_file_service.py
index 8768dfeb..a0bf98aa 100644
--- a/py/services/model_file_service.py
+++ b/py/services/model_file_service.py
@@ -1,7 +1,8 @@
 import asyncio
 import fnmatch
-import os
 import logging
+import os
+import posixpath
 import shutil
 from typing import Any, Dict, List, Optional, Sequence, Set
 from abc import ABC, abstractmethod
@@ -36,12 +37,11 @@ def normalize_relative_folder(folder: str) -> str:
     if normalized.startswith("/") or (len(normalized) > 1 and normalized[1] == ":"):
         raise ValueError("Folder path must be relative to a library root")
 
-    normalized = os.path.normpath(normalized)
-    if (
-        normalized == ".."
-        or normalized.startswith("../")
-        or normalized.startswith(".." + os.sep)
-    ):
+    # posixpath, not os.path: ntpath.normpath would fold the business form back
+    # to backslashes, and every stored folder, cache entry and comparison in the
+    # app is forward-slashed.
+    normalized = posixpath.normpath(normalized)
+    if normalized == ".." or normalized.startswith("../"):
         raise ValueError("Folder path must stay inside the library root")
 
     return normalized
@@ -1062,7 +1062,12 @@ class ModelMoveService:
 
             new_relative = self._calculate_relative_folder(target)
             await self._rename_folder_records(
-                previous_relative, new_relative, absolute_path, target
+                previous_relative,
+                new_relative,
+                # Business paths, like every other absolute path this service
+                # hands out: the scanner re-keys cache entries by prefix.
+                absolute_path.replace(os.sep, "/"),
+                target.replace(os.sep, "/"),
             )
 
             return {
diff --git a/py/services/model_scanner.py b/py/services/model_scanner.py
index 14a3e7ef..00d4f533 100644
--- a/py/services/model_scanner.py
+++ b/py/services/model_scanner.py
@@ -3094,12 +3094,28 @@ class ModelScanner:
         return await MetadataManager.create_default_metadata(file_path, self.model_class)
     
     def _calculate_folder(self, file_path: str) -> str:
-        """Calculate the folder path for a model file"""
+        """Return the library-relative folder holding *file_path*.
+
+        The path arrives in whichever spelling its caller holds: ComfyUI's own
+        (backslashes on Windows) or the forward-slashed business form used for
+        cache entries. A raw ``startswith(root)`` matched neither the mixed nor
+        the opposite spelling, so every forward-slashed path on Windows resolved
+        to the root folder and a moved model was filed under the library root.
+        Compare identities instead, then slice the relative part off.
+        """
+        candidate = _root_identity(file_path)
+        if not candidate:
+            return ""
         for root in self.get_model_roots():
-            if file_path.startswith(root):
-                rel_path = os.path.relpath(file_path, root)
-                return os.path.dirname(rel_path).replace(os.path.sep, '/')
-        return ''
+            identity = _root_identity(root)
+            if not identity:
+                continue
+            if candidate == identity:
+                return ""
+            if candidate.startswith(f"{identity}/"):
+                relative = candidate[len(identity) + 1:]
+                return relative.rsplit("/", 1)[0] if "/" in relative else ""
+        return ""
 
     def adjust_metadata(self, metadata, file_path, root_path):
         """Hook for subclasses: adjust metadata during scanning"""
diff --git a/py/utils/sidecar_paths.py b/py/utils/sidecar_paths.py
index 46c46ea3..c2310e1a 100644
--- a/py/utils/sidecar_paths.py
+++ b/py/utils/sidecar_paths.py
@@ -480,6 +480,19 @@ def _legacy_component(root_path: str) -> str:
     return f"{sanitize_path_component(os.path.basename(normalized))}-{digest}"
 
 
+def _join_component(root: str, component: str) -> str:
+    """Join a mirror component name onto *root* as a native path.
+
+    A component adopted from the pre-identity-map layout is reported as
+    ``<library>/<component>`` -- one *name* spanning two directories. Handing it
+    whole to ``os.path.join`` left a mixed path on Windows
+    (``...\\comfyui/loras-1a2b3c4d\\sub``), which no natively built path
+    compares equal to, so it has to be split first.
+    """
+
+    return os.path.join(root, *(part for part in component.split("/") if part))
+
+
 def _list_component_dirs(sidecar_root: str) -> Set[str]:
     """Return the mirror component directories present under ``sidecar_root``.
 
@@ -556,7 +569,7 @@ def _mirror_dir_overlap(sidecar_root: str, component: str, root: str) -> int:
 
     if not component:
         return 0
-    mirror_names = _subdir_names(os.path.join(sidecar_root, component))
+    mirror_names = _subdir_names(_join_component(sidecar_root, component))
     if not mirror_names:
         return 0
     root_names = _subdir_names(root)
@@ -958,7 +971,7 @@ def resolve_centralized_dir_for_dir(
     if not component:
         return None
 
-    parts = [root, component]
+    parts = [_join_component(root, component)]
     if rel_dir and rel_dir != os.curdir:
         parts.extend(
             sanitize_path_component(part)
diff --git a/py/utils/utils.py b/py/utils/utils.py
index 60c0fd66..f144b245 100644
--- a/py/utils/utils.py
+++ b/py/utils/utils.py
@@ -303,8 +303,10 @@ def _format_model_name_for_comfyui(file_path: str, model_roots: list[str]) -> st
                 norm_root += os.sep
 
             if norm_file.startswith(norm_root):
-                # Use os.path.relpath to get relative path with OS-native separator
-                return os.path.relpath(file_path, root)
+                # ComfyUI names a model with forward slashes on every platform
+                # ("unet/base.safetensors"); os.path.relpath alone returns the
+                # host's separator, which no ComfyUI widget list matches on Windows.
+                return os.path.relpath(file_path, root).replace(os.sep, "/")
         except (ValueError, TypeError):
             continue