Remember to read the patch notes.
Changes & Fixes
- The client now uses the performance stats determined by Server Processing. This does a better job of calculating VRAM use by detecting Material Swaps, so avatars using that technique may have a different rank in-client.
- This means that, in some cases, your performance rank might be downgraded.
- Keep in mind, however, that this is because the information being provided is more accurate, not that our standards have changed
Without more information, or Avatar IDs to check, it is hard to say more than that. But I assume this is your issue.
Probably easier if you make a thread on the VRChat Discord server’s #community-support forum. Then we can discuss it there, since it seems off-topic for here.