Just as the title says. This mount? The Frolicksome Fox Spirit? If you look at it from the back, the player character seems to be sitting around three quarters of a voxel to the right instead of being centered. If you look from the front, it's three quarters of a voxel to the left. It's a tiny issue that isn't even remotely game-breaking, but it kind-of grinds my OCD and I wanted to make a mod for the Frolicksome Fox Spirit but found the offset kind-of discouraging. Example pictures can be seen below.