Go to Setup (buttons 7&8) then EMS and select which display mode you want to edit (100%, 50%, or bottom band). I suspect this is bottom band mode because mine was reversed in that mode also. You can select either instruments or info to edit. Select instruments and select a fuel gage. Once selected you can use one knob to track the gauge vertically and the other to track horizontally. When you have it where you want it select save. Do the same to move the other fuel gauge. You can move anything you want in this mode as well as change the size of instruments.
I have modified my 100% display mode extensively because that’s the one I use the most. I even changed the font size of some of the numbers displayed. I noticed the fuel gauge problem in bottom band mode after I had been flying awhile because I rarely use it.