[bastian74]

That is correct and normal behavior. When you hang up on call 2, call 1 also temporarily gets disconnected and is re-presented to you as a new call. It's just how it works. If you don't like that say good bye and quickly swap back to the call you want to keep active. When the caller hangs up it will take care of itself.

Edit: Actually I assumed that would work, and it sort of does. The problem is it doesn't SHOW that the caller who disconnected actually hung up, so it appears like they're on hold, and if you swap over to them you hear a dial-tone, and then it gets screwed up and you cant swap back without going back and forth a couple times.