Sounds like the previous admin has made bulk overrides to the RF settings for your AP's.
Under wireless -> RF settings you can see/change the profile used by your AP's. You. An also override some of these settings by selecting the AP's and clicking "Edit Settings" -> "Bulk edit settings..."
My guess is that they've manually overridden channel assignment or power. 90% of the time these settings take care of themselves on auto but in some circumstances these can be manually tuned for better performance.
You can clear overrides by re-assigning the profile to the AP. Select the AP -> edit settings -> assign profile, select the profile and on the next page, check the boxes for clear overrides. The review page that follows it will then tell you the changes it's about to make.