I am trying to display the vertices of a polygon with vertex number. In symbology, I have used the Marker line and font marker. .

When the Line offset is -5 positive the text 'P7' is displayed far from the point. So I changed the Line offset to 5, and an extra vertex gets added (p8).

My Question

1. Why does extra vertex appear? (i have checked the vertex editor, there is only one vertex at that position)
2. How can i place the text near the point at the concave section?

I am trying to display the vertices of a polygon with vertex number. In symbology, I have used the Marker line and font marker. .

When the Line offset is -5 positive the text 'P7' is displayed far from the point. So I changed the Line offset to 5, and an extra vertex gets added (p8).

My Questions

1. Why does extra vertex appear? (I have checked the vertex editor, there is only one vertex at that position)
2. How can I place the text near the point at the concave section?