Well I don't know JASS (Lazy me) but what I would do is make two integers. The one i'm going to use, and a second one to save the previous integer.
So
Set FirstIntVar = 1
Set SecIntVar = 1
Set FirstIntVar = 2
Do actions
Set FirstIntVar = SecIntVar
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.