Unable to pull vertices, edges after delete history
I have been trying to fix this all afternoon and it still remain the same. I used the split polygon tool to make the lips, then I pull the edges and vertices, but with subdivision, my Maya interface gets so slow so I decided to delete history.
After that, I tried to pull the vertices and edges of what I sliced earlier, but I can't. You can see the problem attached.
What should I do?