I'm having the same problem.  Currently I can go thru my purchased items list, click on an item and the pop-up will indicate I have not purchased it.  Just found that clearance item I purchased yesterday, I had already purchased over a year ago.  This means I'll have to check ever item before I make any purchase. Definitely slows down purchase process.  At present I feel it's too much trouble to make a purchase.  Please fix.