An individuals group subscription settings sometimes lie in firefox

As an admin user (may be an issue with other users too - I haven't tested fully yet) - create and join a group as a group admin. Then go to /user/{uid}/group_subscription and set your subscriptions for that group to immediate. Now visit the group home page and using the Group Subscription block (assuming you have the block configured to display on group pages) change your subscription to daily. If you go back to /user/{uid}/group_subscription and refresh, the page will not update with the new subscription setting.

I cannot reproduce this in other browsers. Only firefox.