Splitting of groups bug/really getting frustrated!

This is going on the last couple of days and it is getting frustrating.

I am trying to break up my large groups into smaller groups and as I get it down to the number per unit that I want, the game defaults back to the actual numbers within that group.

For example: I have a group of 45 units. I am trying to create a group of 10 out of that. As I select the 10 units, al off a sudden those numbers go back to the original count. I have to back out of the game and get back into it for it to work.

Is this a known issue?

I am in 2 games and it seems to be doing it in one of them. Game #1488531

Thanks