Could be temp files saved by the browser or cookies? is really weird that doesn't update, did you try on another device to access the link using incognito? or could be that the ban is not applied on the website it self and is based on something else but really don't make sence since a banned account shouldn't be accesible anyway maybe they did it incorectly or using the profile link you skip the check in if you are the user since is expected to be used by anyone else and doesn't check if you are ban or no and just redirect you to your profile, just ideas since the oly way to know is by checking the code and that could be a programming error from them