When I look at Groups in the control panel, they're all there. When I look at them under Groups from Home, using the menu on the left, I can't see the last two I created.
The groups also keep changing who is assigned to them, though that seems to have stopped, for now. I don't know why it's stopped, though, so I don't really trust it won't happen again.
Finally, when I click on one group, sometimes the information from another one appears. It seems to be happening randomly, at first just two groups, and then I deleted the one that wasn't showing up when I clicked on it and left the one that always showed up. I recreated the one I deleted. It's one of the ones not appearing, above. Now a different group did it, but I can't get it to do it again.