I still don’t get why you think this is unusual. Take winter 2018 to spring 2018 (I don’t have as much time on my hands as you so forgive me for not doing this for every quarter).
115 college degrees were conferred. From gendered breakdowns we can see that this corresponds to at least 100 people graduating. A few students probably transferred. And then the remainder, at most ~120 students (across the whole school, for a million different reasons ranging from physical to mental to financial) took leaves and withdrew, with the vast majority probably on leave.
That sounds…perfectly normal? 1% of the school having to go on leave every quarter sounds about “right” to me, considering all the things that could precipitate disenrolling. Hard to compare to other schools since I can’t find anyone else that publishes quarterly (or semesterly) statistics.
Edit: and this is assuming the statistics are perfectly accurate, which they probably aren’t. But degrees conferred almost certainly is.