Whenever you add or remove an upgrade to a filing cabinet that applies a different texture, it changes to that texture in singleplayer. This does not happen in multiplayer.

Steps to reproduce:

1. Start up a multiplayer server instance
2. Join server
3. Put down filing cabinet and apply any of the upgrades to it
4. Watch it not change to that upgrade's texture, but abilities relating to that upgrade will still apply
5. Relog to update the model texture on your client