Could feasibly be counting the number of the exterior doors on the property combined. Rather than the number on the individual buildings on the property.

It’s still weird. But given the school is right next door across the parking lot. I could feasibly see such a thing implemented for security purposes on the entirety of the property. Easier to rapidly distinguish between locations for instance on a camera feeds.

Edit: And reiterating my earlier point in another post. Street views often are out of date pictures ranging from months to years old.

Are you able to narrow down the date of the streetview picture? If it’s from January of this year as an example. You might be on to something. But if it’s several years out of date. The numbers could be the result of policy changes months if not years ago and it just wasn’t updated.