Every one of my tiles had a large smattering of very dried on glue on the front of them.  I needed them right away and couldn’t wait for another shipment to get here. So we had to use a razor edge scraper to get the glue off of everyone of them.  It took about 5 to 6 hours to get all of it off,  Very disappointed!... 
They did just give me a 30 percent credit on my blessing, so that was very nice of them!!