I've experienced every aspect of this thread...
When you access an account and CB goes to the homepage instead (or error fetching user menu), that account no longer exists on CB. This happens often when I look up someone I used to help, and find they are no longer a member of the CB community. Some delete their own account, while I suspect others are simply removed for CB TOS violations.
When an account you follow bans you, and you visit the bio, it says...
When an account blocks your gender/region (location), and you visit the bio page, it says...
* with a
VPN, you can appear as if in a different region and often get around this simple block.
Try clearing your Browser's cache files and then refreshing CB. You might just find that you're clicking on a locally cached page, that when it tries to access CB's servers, the fetched data is actually missing. In this case, that user may no longer be registered on CB.
Cheers,
Cexmental