Mentioned this request for Dues Paying Mage earlier.
Got it, but some others--- hostile-- were too tough. Including a Flame Atronach

Beefed-up, I went back to this site and took out the hostiles.
Left the cave and went back in (forgot an item). Another different Daedra Enemy shows up in the tunnel. Barely got him. Tried leaving and returning a third time and got kicked around. Again I assume these are Daedra.

Do these creatures normally regenerate in caves? Is this a bug.
Thanks.

Morrowind, like every other game n the series, has spots where random monsters spawn, depending on your level. In other words, yes, these monsters are supposed to respawn, and they are scaled to your level.

Thus site has turned into a good spot to get Daedra leavings as well as grinding up. Close the door, open it and a new Daedra appears. It is the only cave so far that I have been in that is filled with crystals. So I figure the designers meant it this way.
Fun Game.
Thanks