[Jammin]

Also, just small bugs pre-round where the shop acquired items don't load right and I get some random weapons.

First issue sounds like PS2 is being PS2. Unfortunately, GMod has the reliability and stability of Comcast customer service.

The issue I quoted isn't a bug - you likely spawned on top of map-spawned guns. Some maps are really bad with this, most notably RPG village.
To get your proper guns, throw your guns pre-round (Q) and wait for the round to start without the guns you don't want. Your shop gun should spawn when the round starts.