Old Gutter Guard Metal Left Under Shingles

The metallic helmet gutter on the left was underneath the new shingles. This will make the shingle weaker and wavy at the roof's edge.

The newly installed roof looks better at the edge of the roof.

https://youtu.be/ybxkhbi-pu0

A couple of things here, these edges of the roof get the most abuse. The starter shingles should glue the dimensional shingles. It can’t happen when the starter shingles are upside down or backward. The metal left from the old gutter guards is also a big problem.