How would I go about fixing this gif?

I’m new here so I will do my best to cover all the details.
To start I’m using two programs, Blender and Gimp.
I used Gimp to set up the original images need to build a 3d coin in Blender, used Blender to build and render a 180 rotation of said coin, and went back to Gimp to export it as a gif. Everything has been smooth until I looked at the finished gif.