That doesn't rule out driver bug, but it may also be a limit of your graphics card, specifically the maximum texture size. There are ways of finding out what size that is and knowing the graphics card is one way.
At what size does the image start getting distorted? Usually the texture size limit is a multiple of 2 like 1024x1024, 2048x2048, 4096x4096, etc...
The image in your images is 2500x188 so maybe the max texure size is 2048x2048 for your card, but that's just a guess.
The texture is fine when you run it which makes me think the canvas2d renderer is being used instead of webgl. You can check this with the "renderer" system expression. Webgl has the same limitations as the editor's renderer which uses OpenGL. Canvas2d on the other hand can handle larger image sizes but is slower than webgl.
Solution? Probably just use smaller images, or slice the image up into smaller images.