[Problem] Land sculpting low res?

So i started a project not too long ago but one day when i started it up the map seem to have lost its res or atleast the triangels on the height map have gotten bigger.
With other words i cant smoothen out the ground. It worked before but one day it just stopped.

Im new to this forum but id really like some help with this, the mape is huge and dont really feel like starting all over again.

Sadly theres an database error so i cant upload an image atm.

Sorry for my english not an native speaker.

-check if your quality settings are on epic :slight_smile:
-is it really the same map? + what happens when you copy it into another level?