We recently purchased this home with new roof installation completed day before purchase. We noticed this last week on our roof which seems odd but was explained by the roofer to us that it was cap sheeting and done because of the slope and area of roof and that its more expensive than shingles. All the homes in our neighborhood have similar roofs and I haven’t seen one roof with this yet in our neighborhood. This area also happens to be above the garage corner where water seeped into the block wall during the last storm. I’m also a little concerned this does not conform to HOA by laws since it’s not the same color as the shingles on the roof. Attached is a picture of this area, any help would be appreciated in explaining this area and why it was done this way.