For me it was a case of, "Elementary, my dear Watson." It looked like a decrease at first but you didn't need a decrease, therefore it had to mean ktbl one stitch at a time. Also, having learned to do ribbing this way, it made it clearer. I'm just glad we help you out.
Cheating is an option. . . . Cheaters never win and winners never cheat, but smart knitters who want to retain an iota of sanity do, cheerfully. ~~Kory Stamper