Why is Colin Bridgerton married to Penelope at the beginning of Just Like Heaven but unmarried at the end?

Total FAIL on my part. I messed up, pure and simple. I didn’t catch it, my editor didn’t catch it, my copyeditor didn’t catch it, and my sister didn’t catch it! You know who caught it? My readers. Just Like Heaven had been on sale only eight hours before I heard from the first one. You guys are amazing.