We have encountered a number of issues with the WCS being out of synch with the WLC. The most recent has to do with the wrong firmware version being shown by the WCS after a code upgrade on the WLC. A number of access points (but not all) are shown by the WCS to be on the wrong software revision.
Unfortunately, Cisco has labelled this problem a "feature request" (apparently, the WCS and WLC are "expected" to be out of synch - who knew?).
Anyway, the workaround after a WLC code upgrade is to perform a "refresh from network" which will (hopefully) kick the WCS in the pants and get it to load the correct information.