Can anyone explain whats happening Created 2 years ago2022-11-08 21:48:07 UTC by BugDug

i used carve to make the river but now everytime i look at it this appears https://imgur.com/a/TrIMzOR (theres also the editor image)

This isn't an explanation, I am on my phone so it's hard to see, but: Carving often breaks geometry and is best avoided. I suggest deleting the brushes in that area and remaking it using vertex manipulation
Tutorial: Vertex Manipulation Intro

And remember to frequently take backups of your RMF or JMF to prevent loss of work when things go really wrong