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Hi CrazyPipo.
The problem is that you didn’t applied a gloss coat first. A common thing is that the surface of the plastic is too smooth, nor a mark setter solution. This makes the decals easier to stick on a smooth surface. Don’t know if there is a good substitute for mark setter if you can’t get a hold of it…
To get them stay on, apply a clear coat, being a matte, semi gloss or gloss, whichever you prefer.
If you do this, first apply a very thin coat, from a great distance so the pressure from the propellant doesn’t blow them off. A distance of at least 30 centimeter, or 12 inches should be fine.
After the first coat is dry, you can safely apply an other coat.
Before doing this, you could also, carefully, apply some mark softer on the decals. This melts the decals somewhat, which makes them adhere a bit better.
If you don’t have any excess to mark softer you could use white vinegar.
Hope this helps you out. If you need some more information, please ask

that’s right, as teetee580 said, I’m in decal stage now with the same kit of yours, that also my problem, what I did is that after putting the decals, I immediately gloss coat or clear coat it so that it will stick firmly on to the plastic.