Thank you JenoP, that clarified it for me.  I still don't understand why everything online in QB looks good and just my QuickBooks App shows the invoices with a zero balance and the payment unapplied.  All my invoices in QB show paid in full, no reports are showing anything hanging out there or anything.  My bank statements balance each month and so on.  I don't even use that App.  I just happened to look through it the other day and saw that.  I guess it will be an unsolved mystery.