It started when I imported a bunch of meshes from ZBrush. I began adding cubes around the meshes and when I got the base shape right I started adding more geometry by adding loopcuts. This is when I noticed that the faces of the mesh to which I added a loopcut created these shapes without geometry. After moving the vertices around I noticed that it almost looks like as if the face of the mesh with a loopcut was snapping to the object it was going through . I checked that the snapping was disabled and made sure that auto merge is off as well, but the issue persisted. I opened a new blender file and all was working well. I assumed that It might have something to do with the meshes from Zbrush but once I imported them to the new file all was working fine. Then I opened a new file and the issue came back again. Now it is still present every time I open blender. The same happens when I try to add new geometry by using subdivision.
I tried restoring the preferences to factory setting, reinstalling blender, and applying all transformations in object mode before adding loppcuts but none of it worked.
Since these shapes contain no geometry, I assume that this is a rendering issue, but I have no idea how to fix it.
Any help would be appreciated. I'm still fairly new to blender.