I'm new to Blender and Stack.
I'm making a face in blender and following along with one of the many youtube tutorials. I'm finding that when I select a row vertices and extrude and scale them everything appears fine most of the time. However when I come back to some later that I want to modify it appears theres an extra vertices in the same place with brings in a new face when I move it using G.
Am I doing something fundamentally wrong? I thought that maybe I was selecting multiple vertices when extruding but I'm pretty sure I'm not.
I also wondered if that when I'm looking at the model from the side, I could be selecting extra vertices on the extrude. It just doesn't make sense because when I go into solid mode, everything looks perfect. Except when I move some.
I've included a video of whats happening here