Thanks, Steve
I tried what you suggested and it didn't work for me, however, in making those adjustments I noticed that there was a mixture decrease button assigned to a button on my throttle quadrant that does not exist. I deleted that assignment and things work fine. I have pre-assigned controls for single engine simple, single engine complex, and twin engine complex and checked those settings and found that all three had a mixture decrease button assigned so I deleted those assignments as well.