Put the summary of the bug you're having here

What I expected to happen was...:
The texture staying in place and not drawing attention

What actually happened was...:
When jumpin or starting to walk forwards, the worldborder texture jumps a bit to the right and upwards

Steps to Reproduce:
1. Use a texturepack to make misplacements in the worldborder obvious (for example vanillatweaks' horizontal worldborder)
2. set worldboder to a low value
3. jump while looking at the workdborder (corner)