perhaps check the matrix in the RME DSP mixer for any signals bleeding thru. I had a smililar problem once, and that turned out to be some channels going to channels they were not suppose to go to.
you find the matrix under the menu “view”.
Hi Janno.
Try checking the panner to be certain the track in question is only routed to the front - the default is actually F50 - which is not all the way front, which would be F.
Another way to get the sound in only the pair you want is to open the F4 setup window & create child busses in the 5.1 master output (I always make one for Stereo L-R and another for stereo Ls-Rs)
Finally - I have to ask - why run the 32-bit version on a 64-bit OS with 8GB of RAM?