The reason for the discrepancy is that the data shown in most places of Prime Infrastructure is persisted in the database. So in some cases, like when a config change is made, the database may not be up-to-date. However, some pages fetch information from the network (especially true for some of the pages for wireless management) so the information they display is up-to-date.
The system jobs listed in the job dashboard are the primary mechanism we use to update the database with the latest state of the network. I can't remember which job updates the AP name; I think it might be Status > Lightweight AP Operational Status or maybe Inventory And Discovery Jobs > Wireless Controller Inventory. You can trigger an immediate run or adjust the schedule of these jobs in the job dashboard. I would note though that some of these jobs can be very intensive and consume resources (network I/O, Prime appliance CPU/mem/disk, and network device CPU/mem) so I would advise against setting all the jobs to have a very frequent schedule.
