Member URL structure does not update existing links
One thing I noticed was when you update the member URL structure it doesn't actually update the existing topics posted by the users. When I changed /community to /support it shows /support/profile/USER_NICENAME under the Members tab but if you go tho the forums the links are still /community/profile/
I did try updating the forum stats and user stats
This is cache, please make sure you've deleted all caches and did CTRL+F5 on front.