2006 500 HO Bogs down in mud.

I could use some I help.
I have a 2006 sportsman 500 HO. It has started to loose power and bog down when going through mud in high gear with AWD on or off, however if I shift into low it runs great. I assumed it was a carb issue until I tried low gear and can’t figure out why it looses power in high gear but not in low. Anyone else have a similar experience?
Thanks

2006 500 HO Bogs down in mud.

I could use some I help.
I have a 2006 sportsman 500 HO. It has started to loose power and bog down when going through mud in high gear with AWD on or off, however if I shift into low it runs great. I assumed it was a carb issue until I tried low gear and can’t figure out why it looses power in high gear but not in low. Anyone else have a similar experience?
Thanks