Shader Error

I’m trying to learn Unreal 4 and Blender. I’ve made a simple sword in Blender and sent it to Unreal but ended up with a shader error where the rectangles at the top of it can clearly be seen. The shapes in this part are not dramatically different from each other, so these should not be seen. I don’t understand why this is happening. Please help. Thanks.

The left one is with a basic solid color material. The right one is using Unreal’s chrome material.

I wanted to share my progress with anyone who is curious. I’ve really learned a lot and achieved a lot in a short amount of time (for me, at least). I plan on making a whole game.

The sword is finished, but the axe handle still needs to be painted.