Sent the wrong labels

I used to love Sticker Mule. We used them for years to print our business labels. It's been a couple of years since I've needed a new stickers. Out of loyalty, I went back to them. I submitted my artwork. The proof came back with items on it that I didn't ask for and weren't part of the submitted work. Now, my order comes in and it's some other customers stickers. What's going on?