When I go to spawn on any map in Gmod, I spawn with only my physgun, my camera and my toolgun in single player. What is the problem?
Just before you load a map, at the top of the window you select a map from, there’s an options tab. Click it then make sure the box that says “Start with weapons” next to it is ticked.
Perhaps some addons. As i know gamemodes got their own starting .lua weapon giver. Perhaps something edited that file in your Sandbox gamemode folder.
Sometimes when you install a new skin/addon it will do that. Its not really fixable. You just need to restart the game again.