Im having trouble with random vetice positions. After modeling for a while, i will rotate the mesh to find that there is a hole on one side, in the mesh from where a vertice has moved to within the mesh. when i try and smooth it, the outer vertices get pulled inward towards the rogue vertice. Does this ound familiar to anyone.
Thanks in advance for any help.
pictures please.
Here are the pics, note this has only happened on one side. the other side of the mesh is fine

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