I'm very new to blender so I'm trying to follow this tutorial on creating a base mesh. At 2:37, the guy in the video presses z and turns on wireframe shading on the object. On his tutorial, all the vertices seem to be connected which makes the mesh much easier to work with. When I try to turn on wireframe shading (in edit mode), I just seem to end up with all the vertices floating with no edges connecting them. I've tried resetting my prefences to factory settings in case I had accidently hit a shortcut at some point as well. Screenshot of my cube with wireframe shading.
Any help/advice would be greatly appreciated.