Controls is Showing Xbox Symbols but I'm using Joysticks

In Controls, my assign key is inputting xBox controller symbols (see Large-calibre guns in pic) but I’m using Thrustmaster T16000M Joystick and Throttle. Any ideas what is going on and how to fix it?

Same thing happens when reloading some older .blk files. Some buttons, like Open bomb bay doors, are showing my normal Thrustmaster button. It appears that things still work but it is confusing.

I do have use a Xbox controller on the same PC, for games like Borderlands. Thinking that might be the issue, I unplugged it and restarted War Thunder but no luck.