UVMapping "replication" question

Hello,
Today I am messing around with exporting Star Wars : Empire at Wars model using a plugin from blender, link for anyone interested.

After my export, I noticed that the image in the UV mapping is somewhat "replicated", I have a hard time finding the right word for it.
The mapping is correctly applied in MDLvis, but not in the game or magos/RMS.
My question is :
  • Why that?
  • What's the name of this "concept" that replicated the image?
  • Can I easily solve it so my texture is correctly applied in Warcraft 3?

Pic from RMS and MDLvis to describe the issue :
24-05-09-15-04-29.jpg
24-05-09-12-58-05.jpg
 
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