Sometimes in Xia DLC, map pieces snap in an overlapping position instead of properly snapping side-to-side with no space in-between. Once this starts, further placement is a mess as new pieces will also overlap with the first problematic one. Not sure whether the problem is in the pieces themselves or on the table as I don’t know how snapping is implemented.
Additionally, when moving player pieces around they commonly hit neighbouring player pieces and fall on their side instead of properly snapping in-place. Seems like some work with collisions needs to be done so that doesn’t happen.