Unchecked creature spawns

I'm not sure how the spawn mechanics work exactly, but I thought in Morrowind there can only ever be one creature per spawnpoint, and it will respawn only when the cell respawns (3 days?) or is reloaded after you dispose of the body.

But I'm sure I've never seen these in Morrowind even in very long games over hundreds of ingame days:

Looks like in OpenMW, spawnpoints keep spawning new creatures every time you get close to it.