I bought 2 spools of this thread and first had this problem with #10 Red Heart thread. There was no sequence, it went from #10 to something thicker, then went back to #10 for a while, then got really thin, like #20 or maybe #30, and bounced back and forth all over the reel . and again with the 2nd roll. My napkin came out fine, I was surprised. I would have sent it back but decided I would buy 2 more of these.