Game Mechanics: 30/80 weight while naked

[urzaplanewalker]

I've just started leveling a monk, and I am having some serious weight limit issues. I can barely hold my weapons and armor, and I can farm maybe 10-15 mobs before I have to run to a vendor. I noticed (after dieing) that my weight was 30/80 with literally nothing in my inventory or equipped. This is not a UI bug because every item I grabbed from my corpse added to this. Every time I go over 80, I lose Dex/AC. Is there a reason for this?