while I am using the clay tool for sculpting, this weird resolution is appearing in nearly every model. Some of the texture is painted in orange and I cant use any tools like smoothing (gets it even worse) on it to help out. Is this a Glitch or how can it be fixed ?
I suggest you read this page https://nomadsculpt.com/manual/topology.html
Probably the best for you is to hit the voxel remesh button once in a while to start with.