My state alleges that it did not receive all of the forms I electronically submitted, but my pdf copy shows all the required schedules. Is that possible?

Which state, and what do they say is missing?

could have been a problem at state's end.  but then I would have expected to see more posts like yours  I have not.  are you sure it's actually from your state.       one other possibility - with certain states cetain forms can not be efile and must be mailed .