Shadow from sculpting landscape is weird

Hello, quite new to Unreal Engine so bare with me and my noobish questions.

I have the problem where my lightning creates strange shadows on little test mountain as displayed on the picture below:

Is there anything in particular that could have gone wrong, any tutorial I should check out in specific or something similar. As I said I’m very new to this so any help is welcome!

It looks ok to me, what is the problem for you?