Solution? Moving the part down (Settings, LMM Meeting, Schedule tab, find the week in the top box, highlight the CO talk in the bottom box and use the arrows; particularly the down arrow in this case...). This will probably solve the other issue in the process. If not report back here.
I do wonder how this happened in the first place though. Did you by any chance add the CO exception after importing the workbook? Just to be sure, you would also want to make sure the settings in Setting, LMM Meeting, Main tab are correct: carefully check if the items on the right match their counterpart on the left. If not: correct (the entries in the RH column are from a dropdown: click once and you get to choose).