I've just started learning Blender 2.8 but I'm having trouble with what seems like a glitch.
I have a shoe mesh which I have used knife on to create three stripes so that I can assign materials. I have created a vertex group for all the faces of each stripe.
When I select each individual stripe, the selection is fine, and I can select stripes 1 and 2 together. But when I select stripes 2 and 3, an extra face between the stripes is also selected.
I've tried breaking up this face, deleting it and re-making it, breaking up the adjacent face in the stripe, all kinds of things, but I cannot stop this behaviour from happening! As I'm so new to the software I keep thinking it's something I've done wrong, or neglected.
But I've removed the vertex groups and re-made them (several times) but the same behaviour occurs.