weird geometry

hello out there
Suddenly the smooth brush in sculpting is behaving strange
weird geometry is showing up…
Someone can help me point out what s going on?
am working with xp pen deco pro

What have you done before?

Looks like its still in sculpting stage so one time voxel remesh and its gone.

thanks for you reply
no clue what I ve done
ps with voxel remesh the bumps stay…

though the smooth brush works just fine in fresh new blend file…

I appended the object in a new file : problem solved brush works fine
but amount of vertices somehow doubled :roll_eyes: