I took another look at the pipe textures, and they're completely different. The official texture has the caps in the bottom left, while the Horizons version has drastically different textures with the caps in the top left and down the left side. It's a night and day comparison. I changed the filenames to replace the "a" with "f", and will see if they break anything on the Horizons map.

I'm going to make the English version of the textures now

Regarding the pipe issue: It seems that the file path in question is "models/props_pipes/pipesystem01a_skin1" (as well as two other skins) which is used by a series of vanilla HL2 pipe models in the folder "props_pipes". If the texture you're using is from a different source (such as Dead Space) and is a necessary part of the Horizon map, you'll probably have to change the file names.

This seems to be a recurring issue with map resource packs; for example, Chaparral and Watching Paint Dry overwrite the Generator, either replacing the model with a version that has a different UV map, or the texture with one that's mapped different (I don't know which one is the case)

New Development, It somehow fixes this one Pipe Prop Texture Issue i had for YEARS, You think this has something to do with the Other issue? Check my Screenshots to see the Pipe Textures/Model.

Thank you :)
I just don't really know how to fix this if I'm honest

@ John Oakman

Did you get my comment? I Gave You, The Link.

https://steamcommunity.yuanyoumao.com/profiles/76561199589044433/screenshots/

Here You Go.

put a link?

Well how do i upload pictures via comments?

Hhmm no clue why, got a picture?

@ John Oakman

The content pack messes up Textures for certain pipe models, and would also explain why the Urinals in the Map are messed up too.

best map

BAROTRAUMA?!?!?!??!