That was lucky I grabbed the 500mil, because that was the only one I looked at.
The contact probably became bigger because it was now showing it's correct hole size. On a side note I have noticed that if you pull a node out of a group, because it's a child of a parent their attributes change.
I had a play with those extra groups a while back - mask - and didn't see much, but then again I didn't know what I was doing.