So I'm guessing this is where this issue is coming from.
Like paddington posted a month ago; but with GUIShop, I get this:
Loaded plugin GUIShop v1.8.5 by Khan
11/12 13:24:02 | [Image Library] Starting order GUIShop
11/12 13:24:03 | [Image Library] There was a error querying Steam for workshop item data : Code (400)
11/12 13:24:04 | Image failed to download! Error: HTTP/1.1 404 Not Found - Image Name: twitchsunglasses_0 - Image URL: https://rustlabs.com/img/items180/twitchsunglasses.png
11/12 13:24:04 | Image failed to download! Error: HTTP/1.1 404 Not Found - Image Name: twitch.headset_0 - Image URL: https://rustlabs.com/img/items180/twitch.headset.png
11/12 13:24:05 | Image failed to download! Error: HTTP/1.1 404 Not Found - Image Name: vehicle.chassis_0 - Image URL: https://rustlabs.com/img/items180/vehicle.chassis.png
11/12 13:24:05 | Image failed to download! Error: HTTP/1.1 404 Not Found - Image Name: vehicle.module_0 - Image URL: https://rustlabs.com/img/items180/vehicle.module.png
11/12 13:24:05 | Image batch (GUIShop) has been stored successfully
11/12 13:24:06 | [Image Library] Starting order GUIShop
11/12 13:24:06 | Image failed to download! Error: HTTP/1.1 404 Not Found - Image Name: twitchsunglasses_0 - Image URL: https://www.rustedit.io/images/imagelibrary/twitchsunglasses.png
11/12 13:24:06 | Image failed to download! Error: HTTP/1.1 404 Not Found - Image Name: twitch.headset_0 - Image URL: https://www.rustedit.io/images/imagelibrary/twitch.headset.png
11/12 13:24:07 | Image failed to download! Error: HTTP/1.1 404 Not Found - Image Name: vehicle.chassis_0 - Image URL: https://www.rustedit.io/images/imagelibrary/vehicle.chassis.png
11/12 13:24:07 | Image failed to download! Error: HTTP/1.1 404 Not Found - Image Name: vehicle.module_0 - Image URL: https://www.rustedit.io/images/imagelibrary/vehicle.module.png
11/12 13:24:07 | Image batch (GUIShop) has been stored successfully
The new twitch integration update just happened recently so that may be normal, but what about vehicle.chassis_0 and vehicle.module_0.
Also, I notice in the console it says Error: HTTP/1.1 404 Not Found, yet in the servers config file(GUIShop.json) its all HTTPS. Could that have something to do with it? Ive seen that before when I had changed a HTTP to HTTPS thinking it'd be more secure(because why not:P) but it broke it so I had to change them all back to HTTP.
Hope that helps.