Problem on making a skin on Volvo FH16 2012 8x4 chassis

[crazyfrog]

Hello. I make different skins on different trucks whenever I feel bored on existing ones. But this time, I'm having trouble skinning on Volvo FH16 2012 (SCS), particularly on 8x4 chassis. I made a testing skin for this truck and I noticed this:

When choosing the 8x4, the text above the door on the left side of the truck will bend (or whatever you call it) but it will not on 6x4 (or the other chassis except 8x4).

On the right side, any text or decal is just fine.

This is my first time placing a text (or decal) on that part.

This is the skin I made.

And my save settings for the skin (I use these settings every time I make skins on different trucks and worked fine).

Regarding on the first photo, any ideas how to fix this problem?
Thanks for your reply and regards.