Are you using the Display.Church groups widget with a Pushpay/CCB integration?  If so, you are probably opting to show the Registration status so your people know whether or not they can opt-in to the group.

Just to make sure you are aware…

The registration status will show as open under two conditions:

(1) The group capacity is unlimited.
(2) The members count is less than the group capacity.

Display, group widget, Pushpay / CCB, small groups