Since you mention in air (on air) meter it suggests that this desk had broadcast use in mind and as such these particular meters may have had an insert point on a jackfield so would appear on separate punch blocks or connectors. This was common practice on UK broadcast desks (which yours obviously isn't). Also the meters may have a 'relay' that flips them to read PFL or AFL that is being activated accidentally.
Presuming you haven't unplugged a cable sometime.
Best
Matt
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