Incorrect UV-mapping on a quad

Hi guys! I face a weird problem with rendering a texture of a quad. Here is my texture:


And this is how it is rendered in the scene with a standard shader:

As you can see, if you zoom the quad, you can see that the lower pixels of the gradient are rendered at the top of the image as though the uv-mapping is ringed and a little biased. The same effect may be seen the lower edge and, if I had a proper gradient, it may be observed near the side edges too.
Maybe someone knows how to solve this problem?))

 

If that's a texture, make sure it's set to clamp (vs. repeat).

Edit: just noticed you already said it was a texture (bad habit of skimming)

 

Yes! It works! Thank you @polemical