Gaps In Terrain Layers

i have question?
when i use srtm terrain there gaps in the jointing lines is that srtm problem or unreal engine problem.
now when i use the same srtm area in train simulator classic there no gaps what so ever.

 

Those should not appear, try the SRTM from this link: https://www.viewfinderpanoramas.org/Coverage map viewfinderpanoramas_org3.htm if it is still not working, it is the UE

 

ya same thing with the new srtm from that site. so it the unreal engine.

 

Try right click on the landscape and press "stitch tiles in tier"