A little update
While i was searching the internet for this strange situation, i found that vinyl straps can damage the finish of the guitar, with marks like the one on the explorer i posted. Its something like vinyl create a chemical reaction that soften and melt the lacquer especially when the guitar rests in her bag and gets warmer, even if not touching it only by its gas. So freaking strange. By the way, if its this kind of situation, will it be difficult/onerous having it repaired?
Thanks, friends