Hello there,
There was a bug in version 2.1.5 and 2.1.6 that caused Buttonizer to lose it's position data.
This issue has been fixed in version 2.1.7.
The fix prevents users that hasn't been affected by the bug from losing their position data, but if you have already been affected by this bug, unfortunately, version 2.1.7 won't get your position data back.
For those that has been affected by the bug, you could manually set a position to your group again to make your button appear.
Apologies for the inconvenience!
