Unsubscribe from all your addons, then navigate and delete all files in the following folders:
\steamapps\workshop\content\4000
\steamapps\common\GarrysMod\garrysmod\addons
\steamapps\common\GarrysMod\garrysmod\maps
\steamapps\common\GarrysMod\garrysmod\download
After you have deleted all files in these folders, verify your game data, then relaunch it and let the addons install. If the issue persists, reinstall gmod as a whole.
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