I'm making a model of a gyroscope that I want to export for rendering when I'm done, but I ran a quick meshing test and there are some problems.

The problem is this cap piece:


As you can see, this looks fine normally.

When I go to mesh it though, there are some nasty artifacts that I've highlighted in the pic below. These remain no matter what meshing angle I use.


Is this a problem with my settings, or is it a bug that has to be fixed?