Looks to me like sth. is borked. No way should/could one hit with the pickaxe "remodel" so much ground.
-> I suspect the world save to be corrupted.

See if the mod upgrade_world[github.com] can help. Do NOT forget to make a backup!

After more testing it's just getting worse. every crypt door or anything like it just makes the ground go crazy (they are basically portals themselves), then I use the portal and it goes back to OK. can't build on shifting terrain so I'll probably have to abandon this base. there's about 6 hours I'll never get back.

Originally posted by L1m3r:

Looks to me like sth. is borked. No way should/could one hit with the pickaxe "remodel" so much ground.
-> I suspect the world save to be corrupted.

See if the mod upgrade_world[github.com] can help. Do NOT forget to make a backup!

I used mods in the past, not for me. I was actually hoping I could fix it with dev commands

Originally posted by UncleAcidic:

After more testing it's just getting worse. every crypt door or anything like it just makes the ground go crazy (they are basically portals themselves), then I use the portal and it goes back to OK. can't build on shifting terrain so I'll probably have to abandon this base. there's about 6 hours I'll never get back.

Originally posted by L1m3r:

Looks to me like sth. is borked. No way should/could one hit with the pickaxe "remodel" so much ground.
-> I suspect the world save to be corrupted.

See if the mod upgrade_world[github.com] can help. Do NOT forget to make a backup!

I used mods in the past, not for me. I was actually hoping I could fix it with dev commands

The only vanilla command(s) I found that might help is "optterrain"...

I am having issues where terrain is one way when I pass through an area and it changes when I pass back by after using a portal. Specifically a trench I dug to keep draugr in a building goes from a simple moat 2m wide to being a gaping hole extending under the building letting the draugr out. If I fill in the area and leave it turns into a mountain of stone covering the front of the building and filling in my trench. If I dig it out and leave it changes from a moat to a gaping hole again letting my sausage mats run free killing the locals.

https://steamcommunity.com/app/892970/discussions/1/6620894968772151602/
^^ just a similar issue - no solution

What are your seeds and where is this happening?
Tried creating a new map with the same seed and compare? (won't help directly but might narrow down the root cause)