The example you give is a consequence of the fact that the person installs your mod and any other standard camouflage.
As a result, first your mod is drawn, which you draw on the ship itself, and on top of it the standard camouflage already selected by the user is drawn.
In order to prevent this from happening, there is an option in the selection of modifications:
Installing a mod that removes the display of standard camouflage will eventually do the following:
Standard camouflage will be transparent, and your mod applied to the ship model will be visible.
Why is camouflage removal divided?
Because it has to be a conscious choice of the person who sets any camo mods.
By selecting this option, the person will eventually not display all the other standard types of camouflage, although the bonuses will work
You can of course use a more subtle setting in the work you presented, disabling the image of the camouflage only on a particular ship.
But you should understand that this entails the assumption of responsibility, timely updates published by you modification, as otherwise, the person who installed your not updated mod will have a problem.