It is entirely possible that they were told quota would be 30 but that particular chapter would have a logistical problem with more than 22. For example only 22 sophomores available to be bigs or only 22 graduating seniors expecting to leave 22 spots available to move into the house next year...
In any case - panhellenic sets quota and chapters are expected to take quota.
I thought of a much more nefarious explanation, but I like yours better.
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