Hotspot issues

Hello, when i connect with my iphone 4 to my hotspot, the first time he will connect correcly.
but sometimes the connection changes into AUTO-LOGIN functionality (see attachment). how is this possible? is this a bug in ios6? i dont want to tell my customers sometimes the must change the wifi settings. When i FORGET MY NETWORK and reconnect, this auto LOGIN function is gone for X time.

who can help me?
foto1withconnect.PNG

Check “/ip hotspot profile”. How do you have the login-by set? If it has “login-by=cookie,http-chap”, then that would explain it. The cookie will log you in for a few days until it expires.

tnx for your reaction.
i have MAC, HTTP CHAP, HTTP PAP on.
is this incorrect?