Why is my Line Renderer bending?

For some reason whenever I try and change the width of this line render component over time, it seems to always insist to straighten and bend the bottom of the texture but not the top, I am not sure why it has a tendency to do this, does anyone have an idea?

I swapped out the “2D-Graphics” tag for “Graphics” as the LineRenderer is not a 2D feature at all, it’s fully 3D. Adding 2D tags puts your question in the 2D product area.

Thanks.