The UV shifts right, but the image shifts left. The far left was 0, and it becomes 0.2, so the part of the image that was at 0.2 now shifts to 0.
If you have any 3D software like Blender and such, you can open a model’s UV unwrap and see it in real time. If you move the UV unwrap right, the texture on the model shifts left and vice versa.