it sounds like your input routing is set up wrong.. it should describe how to set it up properly in the cubase manual. delta in 1 and 2 are the xlr ins when you're setting up your busses.
make sure the track you're recording on is set to record the correct "side" of the stereo input bus.. xlr 1 should be stereo in 1 Left and xlr 2 should be stereo in 1 Right..