Contacts moving from group to group randomly. why?

I am having some problems...contacts are moving from group to group on their
own. Groups disappear and my contacts from that group will appear in another
group which may or may not be the "other contacts"
group. Yesterday 25 of my "friends" appeared in another group after the
friends group disappeared. I renamed the full group to friends and moved the
2 that didn't belong to a new group with an appropriate name and all looked
fine for a few hours. Now i just noticed that "friends" has only 3
contacts, "other contacts" moved from a hand-full to 11 and a 3rd group is
up from about 10 to
almost 30.

WTF

Leon
..