Vertex won't smooth. Folds in on itself?

I don't know what is causing this issue, I've posted screenshots to show what I mean. No matter what I do, if I delete the faces and remake it, there's always a vertex that won't conform with the rest of the mesh, even if I move all the verts around it, it won't move. I don't know what happened and have no idea how to fix it with out just remaking the entire thing. If I move it within the face it like overlaps itself, I don't know what to press to fix it. https://i.imgur.com/zTIzVy0.jpg https://i.imgur.com/VbHOVs7.jpg https://i.imgur.com/IQylBEO.jpg