when you close out of honorbuddy it can take a minute or two, before that session you where using, gets closed out on the server, if you where to try again right now, you probably wouldn't get max sessions as it should of already let go of the session that was in use.
if your still getting it after a little while, you can login to
Home Page - Buddy Auth Portal with the e-mail you used to buy and kill your sessions manually. then you should be able to login normally.