Issue with (weird) bugged textures in addon interior

I recently added an add-on hospital to my server, and I’m having an issue with the textures. They are changing to random other textures. Here is a clip, so you can see for yourself. I got the file from here. I tried restarting and reinstalling the files, but it didn’t work. The server.cfg file should be correct too. Here is a censored copy of it.
I couldn’t find any help with this topic so far.

Thank you in advance.

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