Mods that require an update are not properly updating

Mods are not being updated properly for my dedicated servers; I have it properly set up in dedicated_server_mods_setup.lua in the mods folder (picture attached), but whenever I relaunch the server (and there is a pending update for the server's primary mod: Steam Workshop::Cavemen (Updated) (steamcommunity.com)  the mod does not acquire an updated version of the mod. Please help!