deleting exercises from strength training section

I have tried a few times now, but I am having trouble deleting exercises I added from the strength training section.  I click delete all, it asks me if I'm sure I want to delete, I say yes, then it disappears from the section.  However, when I click save it reappears.  I have tried this many times now, same result.  I did add "general" a few times as a test to see if that would do anything, but it has now just stayed. This isn't anything urgent, just more of a "it would be nice if it were gone" type thing.  I think the problem is that I entered 0 sets.