Does anyone have an idea what’s causing this. And blender it lines up perfectly but after exporting it this happens
Hello there @El_Old_Coyote!
At first glance, that looks like a misplaced section of a UV map, touching the very edge of that seam. So, the first step would be to make sure that your edges are not overlapping in the affected UVs.
After that, we have the usual shenanigans between Unreal and Blender, they just don’t have the best relation. I would test resetting import/export settings in both platforms, then transfer your assets again.
For further methods to test, please check the related scenario below:
Ah, it was the precision issue (I don’t recall where I posted about it). I modeled stuff in smaller scale and scaled it up on export (or before export, same difference). Basically, to avoid this issue one has to model in Blender in 1:1 scale and export as-is, without rescaling. Then there are no seams/gaps in UE.