Maybe you have Tag rule for some of the groups and if some the systems doesn't have the rule are moved to other group
Check your groups maybe they have sorting criteria and Tag rule applied and if some of your machines doesn't have te tag they are moved to different group
Thanx Alexander, but I don't think that the tag are the problme. They work fine.
I think that the problem is that I have too mutch point of sync.
1 point of sync for the root of Ad
1 point of sync for the OU that cointain the pc just insert in the domain and so they are without mcafee
1 point of sync for the OU contain Servers
and some others....
all teh sync are scheduled except the first, the one that point to the root.
a couple of ours ago I have start manually that sync and now seems that all work right...