group disappears temporarily from list

This isnt critical, but when I do these steps, a group drops from the list of groups in a folder. Then after a little while, it re-appears:

0. Act as admin
1. See a folder in "explore" which a bunch of groups
2. Click on a group (mine is a
3. Click on manage members
4. Click on add members
5. Search for some members
6. Decide you dont want to add any, and click on the parent folder of the group (under "current location is")
7. See the group not in the list
8. Click on "Explore", and the group pops up again

Thanks,
Chris