diff --git a/QUESTIONS.md b/QUESTIONS.md
index cbb4ea2..add46da 100644
--- a/QUESTIONS.md
+++ b/QUESTIONS.md
@@ -16,82 +16,68 @@
 behavior is preserved as-is. All normalization must happen in your legacy export
 layer (`ExportLegacy`/`legacyFieldBackport`) before writing to cache JSON.
 
-The Node classifier re-parses download filenames and validates them against the
-cache's pre-classified fields. If the cache value doesn't match what the classifier
-extracts from the filename, it **drops the entry** (returns null). Dropped entries
-cannot be resolved for any user.
+## REGRESSION: amd64_v2 regex matches version numbers (257 new warnings)
 
-## Progress: 3,746 warnings remain (was 6,149)
+Your `amd64[_-]?v2/v3/v4` regex fix in `4f09649` is matching version numbers
+in filenames. Example:
 
-### FIXED: universal2 → x86_64 ✓
-### FIXED: solaris/illumos → kept as-is ✓
+```
+syncthing-freebsd-amd64-v2.0.5.tar.gz
+```
 
-Both are confirmed working! Cache validation passes 6/6. Great work!
+The classifier detects `x86_64` from `amd64`, but the cache now says `x86_64_v2`
+because the regex matched `amd64-v2` (where `v2` is the start of the version `v2.0.5`).
 
-- cmake resolves to v4.2.3 (was v3.19.1), universal2 entries all have arch=x86_64
-- hugo resolves to v0.157.0 (was v0.101.0)
-- terraform solaris entries correctly have os=solaris (393 entries)
-- syncthing solaris entries correctly have os=solaris (401 entries)
-- syncthing illumos entries correctly have os=illumos (261 entries)
+**This affects 257 syncthing entries.** The regex needs to be anchored so it only
+matches `amd64_v2` / `amd64-v2` when NOT followed by a dot/digit (i.e., not a
+version number). Or better: only match when the `v2`/`v3`/`v4` is at a word
+boundary or end of the arch segment.
 
-## Still needs fixing:
+## Progress: 3,977 warnings (was 3,746, regression from syncthing)
 
-### 1. cmake source tarballs (2,478 E_MISSING_OS)
+### FIXED ✓
+- universal2 → x86_64 (cmake, hugo)
+- solaris/illumos kept as-is
+- mipsle → mipsel, mips64le → mips64el
+- ARM variant mismatches (most)
+- android dropped from legacy export
 
-These are source archives with no OS in filename, e.g.:
-`cmake-3.22.0-rc1.tar.gz`, `cmake-3.22.0-rc1.zip`
+### Still needs fixing:
 
-The classifier can't detect an OS → drops them. These should be excluded
-from the legacy export entirely — they're source bundles, not installable binaries.
+#### 1. syncthing amd64_v2 regression (257 new — priority!)
+See above. The `v2` in `v2.0.5` is being captured as an arch micro-version.
 
-### 2. git entries (500 E_MISSING_OS)
+#### 2. cmake source tarballs (2,478 E_MISSING_OS)
+Source archives with no OS: `cmake-3.22.0-rc1.tar.gz`. Should be excluded.
 
-Same issue — source tarballs or entries without OS in filename.
+#### 3. git entries (500 E_MISSING_OS)
+Source tarballs / no-OS filenames.
 
-### 3. iterm2 entries (475 E_MISSING_OS)
+#### 4. iterm2 entries (475 E_MISSING_OS)
+macOS-only .zip files but filename has no darwin/macos.
 
-No OS in filename. These are macOS-only .zip files but the filename doesn't say
-darwin/macos. Consider excluding from legacy export or setting os=darwin.
+#### 5. dashcore entries (127 E_MISSING_OS)
+No OS indicator in filename.
 
-### 4. dashcore entries (127 E_MISSING_OS)
+#### 6. Minor (~62 remaining)
+gitea 54, jq 24, bun 20, sttr 18, etc.
 
-Same pattern — no OS indicator in filename.
-
-### 5. ARM variant mismatches (~100+ dropped)
-
-Remaining mismatches in smaller packages (gitea 54, jq 24, bun 20, sttr 18, etc.):
-
-| Cache value | Classifier detects | Fix |
-|---|---|---|
-| `armv6` | `armel` | emit `armel` |
-| `armv6` | `armv7` | emit `armv7` |
-| `armhf` | `armv7` | emit `armv7` |
-
-### 6. Minor
-
-- `sttr` .pkg (18): macOS .pkg files, upstream quirk
-- Various small packages with arch mismatches
-
-### Test results (latest cache, 17:19)
+### Test results (cache 17:27)
 
 - **19/19** installer-resolve ✓
 - **49/49** live-compare (5 known) ✓
 - **190/196** broad sweep (6 expected) ✓
 - **31/31** live-installer-diff (1 known) ✓
 - **6/6** cache validation ✓
-- **3,746** PACKAGE FORMAT CHANGE warnings (was 6,149, down 39%)
-
-The biggest remaining items are source tarballs being included (cmake 2,478 +
-git 500 + iterm2 475 + dashcore 127 = 3,580). Excluding source-only entries
-would bring warnings down to ~166.
+- **3,977** PACKAGE FORMAT CHANGE warnings (was 3,746 — regression from syncthing)
 
 ## Previously resolved
 
 - [x] universal2 → x86_64 (cmake, hugo universal entries)
 - [x] solaris/illumos kept as-is (not translated to sunos)
+- [x] mipsle → mipsel, mips64le → mips64el
+- [x] ARM variant fixes (armhf→armv7, armel, arm-5, arm-7, armv6hf)
 - [x] Hugo macOS arm64 — resolves v0.157.0 .pkg
 - [x] go armv6l — cache emits `armv6`
-- [x] armel → armv6, winx64 → windows
-- [x] Issues 1-3, 5: WATERFALL, .git shadowing, man pages, musl libc
-- [x] ANYOS question: Specific-OS-first is correct
 - [x] android entries dropped from legacy export
+- [x] ANYOS question: Specific-OS-first is correct