First go into your call log and make sure to delete all calls. Do that by going into messages and then clicking the menu button. Goto view floders then find the folder that says missed calls open it. delete all the calls in there. That shoould solve the problem. If not you can go into DM and Wipe your device and then reload everything except the missed call.
When I first got mine, I had the same issue then realized it was posting in 2 places. I hid one. There is probably another more accurate fix for this but it worked. I probably chose the wrong thing during set up originally.
Hey, I am in Tulsa too! Well sort of anyway, I commute from a little dinky town.