Do you remember how you created the round object? It's kind of messed up, it's a surface that sort of wraps around twice on itself.

You might get this kind of problem shape right now if you do a revolve where you do something like have a circle and then do the revolve with an axis down the middle of the circle, instead the revolve axis needs to be all on one side of the curve right now, so like if you wanted to revolve a circle into a sphere you would need to cut the circle in half and revolve only the half.

- Michael