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- Some of them have an error page : (I could reproduce when tried to connect with e-mail)
This page doesn't work
ERR_TOO_MANY_REDIRECTS
You have a redirect loop somewhere. If using CB Auto Actions unpublish it to see if you've an auto action configured that's doing it. It could also be a 3rd party User or System plugin in Extensions > Plugins. If using verify consent within "Community Builder System plugin" try turning it off to see if there's an odd redirect loop happening there.
- And others have no problem at all...
Find what's different between the ones with and ones without the issue to have a better idea of what might be the cause.