Custom models [Need help]

Could there be something wrong with the actual decal?

Maybe, Something here in the text may help

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Creating bullet holes in the Source Engine involves several steps, and the exact process may vary depending on the specific version of the engine you are using. Here is a general guide on how to create bullet holes in the Source Engine:

Create a Decal Material:

Design a texture that represents the bullet hole. This texture should have a transparent background and the bullet hole image itself.
Save the texture in a supported format (such as TGA or VTF).
Compile the Material:

Compile the material using the Valve Texture Tool (VTEX) or any other tool that is suitable for creating Source Engine materials.
Place the compiled material file in the appropriate directory within your mod or map structure.
Create a Decal Entity:

In your map editor (such as Hammer for Source Engine), place a decal entity where you want the bullet hole to appear.
Set the material of the decal entity to the one you created in the previous steps.
Adjust the size and orientation of the decal entity to fit your level design.
Configure Bullet Hole Parameters:

Some versions of the Source Engine may allow you to configure additional parameters for decals, such as how long they should stay visible or fade over time. Check the documentation or entity properties for any customization options.
Testing:

Compile and run your map to see the bullet holes in action. Shoot surfaces where you've placed the decal entities, and observe the results.
It's important to note that the specifics of creating bullet holes may vary depending on the version of the Source Engine you are using and the tools available for your game development environment. Always refer to the official documentation for the version of the engine you are working with and any specific modding or mapping tools associated with it.

If there have been updates or changes to the Source Engine after January 2022, it's recommended to check the latest documentation or community forums for accurate and up-to-date information.

I decompiled your map and set the above to bounding box and not solid and remains the same when I shoot them(snowman mainly). I'd still give it a try on your end. When I shoot the destructable prop that reveals bunny slippers it works fine after decompile for reference..

Also, When I noclip up to the room in question.

I noticed you have a stray xmas present on the roof in the room just below.

Maybe, If wallit gets some time they can ponder the issue a little.

Just random that I noticed. Maybe, That was thier secret santa gift 😁

As for the the actual issue. I'd keep a note of it. I don't think it is mission critical if just for friends.

It has me curious still...