Strange isn't the word...
OSU does set quota (25). Their big thing is that there's a hard cap in place for total (100) and no chapter can go over that number whatsoever. If taking quota would put a chapter over total, then that chapter's quota is adjusted to whatever number of new members that would put them at total.
So, say XYZ had 80 members before formal recruitment. XYZ would actually only have quota of 20, since 25 would put them over campus total and would use 20 as their quota figure for chapter reporting and award consideration.