I think there's a bug in the fill pattern feature. I create my sketch, and enter all of my parameters for the pattern and everything works fine. However if I need to go back and edit my anything, all of my values in the feature change.

Before:

During revision:

Its strange because the new values are always the same and I have no idea where they come from. Anyone else have this problem? Solution? Work around? I have two other fill patterns on the same part and neither of them do this.