I seriously would like some help here

I’ve tried posting on this seemingly dead forum before and the moderator must be in a coma or something, never approved my previous post, but hey, I welcome you to prove me wrong.
Anyways, I’m wondering why the heck I’m getting these weird anomalies in my terrain?
In the basins the streams seem to be too deep and going down steep mountainsides it seems to be elevated.
Any ideas on what is causing this and how to fix it?
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