Sat Jan 08, 2022 3:17 pm by bob
Usually this is the result of a mismatch in the game render resolution and the region size being used for the main region. Although I would normally expect the UI to also be distorted too.
If you have some kind of skin/UI replacement being used that could be part of it (idk if the game supports such things).
Another choice is that the game is set to Full Screen, and it should not be.
Sometimes switching between the window/fullscreen options will fix such issues as it causes the game to re-look at what resolution it should be rendered at.
Sometimes you just need to manually set the resolution if you have the choice.