Strange issues with physics objects in local server

[Mikraichu]

I'm not sure when this started, as I typically play multiplayer, but...

When I click "Play Singleplayer" and load any map, the map loads fine and all props are normal.

The problem is, when the player tries to interact with them (by bumping into them or jumping on them), things get odd. The player always seems to get slightly stuck to the object. Its most evident when trying to jump off it.
Walking against an object tends to get you stuck on the side of it unless you walk directly away from it. Walking along its side doesn't work.
Jumping on an object works fine, and you don't get stuck while walking on it. However, it takes several attempts to jump off of the object before I actually jump.

I don't remember changing any physics options as of late, and I've verified my game files. This doesn't happen on multiplayer (not that it would).

Are there any cvars that might accidentally cause something like this?