I'm going to do some checking, but it really likely has to do with how these features are built, where they look through your whole inventory, vault, etc to compare to wishlists.

If you have a ton of items across those, it's likely to be brittle, but I'm going to have it show me the query from your account perspectives! Hope to have it fixed soon.

Just pushed out some fixes for the wishlist, and general tree views.

That should hopefully resolve a lot of the issues!