When I am attempting to sync my grades, a few assignments are showing up as listed twice and therefore won't sync.  I looked in the modules and the assignments, and none of these assignments are listed twice.  When I click on 'edit assignment dates' in the assignments screen, I do see the assignments in question listed twice.  

I created the complete modules in sandbox then copied them to each of my active courses. In only ONE of my courses is this a problem. In the other two everything syncs just fine. 

I can't figure out how to delete one of the assignments. For a couple of the assignments, students have submitted work. For the others, students have not yet submitted any work.  We have our grades due in a week (we are Aeries SIS). Any suggestions would be appreciated.