sometimes food can sit at the wrap site if it is a bit tight or still swollen. This maybe what is causing you pain. Or maybe it's what you ate and stretched it a bit more than usual. That takes quite a while to heal in there.
That incision site usually stays tender for quite some time. I believe it's the one they use to hold the liver out of the way and gets pushed against the ribs pretty hard. I know mine was sore way longer than the rest both times. I slept in my recliner for 4 weeks after my Nissens. Couldn't lay flat til then.
Nissen 6/06 and 5/09