Strange Texture Behavior between imported mesh and native UE mesh

Hi everybody,

i’m new to UE . Now i came across a strange behavior which kills me now for 3 nights… grrr…
I have an imported mesh from Blender, it’s just a plane. When i apply my custom created texture, the texture looks like it’s stretched.
Creating a plan in UE and applying the same texture it looks fine.
What the hell am i doing wrong??

The upper one it the imported mesh, the lower one the UE plane.
In the UE mesh editor both UV Chanels look the same.
I tried different UV map options in blender, but no change in UE…

Can anyone please give me a hint…