Surround in Samplitude

Mixing for film.
So I've set up to do a surround mix and a stereo mix at the same time. I put limiters on the surround busses at -12dB because broadcasters throw a fit when you go above -12dB.
http://i.imgur.com/RAdndLX.png
Then I do a bounce like so:
  http://i.imgur.com/8MX5VNn.png
But what I GET is a bunch of levels that look like this:
http://i.imgur.com/ODnKgZg.png

With the way I thought I had everything set up all those levels should have been -12dB. But those first two tracks LOOK like what I'd think the stereo master should look like (if my calculations using this dB calculator were correct.) http://www.sengpiela...culator-spl.htm
I mean that's the way they should look if the limiter wasn't applied to them.

Is this functionality in Samplitude broken? Does anybody work with surround+stereo masters?


I have this feeling I'm one of like three people who uses Samplitude this way. ;-)