Imported fbx has texture distortions

I am a beginner at uv mapping and materials. So with my limited knowledge, I uv unwrapped some objects in my blender file, and then exported them to unity. While in unity, I applied some materials and saw that there were lots of distortions on the surface. After trying to do the unwrapping manually, I got the same distortions again. My question has gone unanswered in blender forums since my blender file was not the one causing the problem, so I wanted to try my luck here.

Here you can see the stretching in unity. The second image is from the blender, the same mesh and a different material I added in blender. The last one is the uv map of the said mesh.