Hello, i'm looking for advice. I had a new roof put on this summer. When cleaning off my roof, I noticed that water pools on the bottom row of shingles on this section of the roof. This section covers an exterior patio and has a shallower pitch than the rest of the roof. This section actually did not have shingles before the new roof was installed but had flat roof material. I got several quotes and some recommended shingles on this section and some did not, but the guy I went with said the pitch of this section did allow for using shingles. Is it a problem to have water pooling like this, and if so, what can be done to fix it? I live in a mild climate without snow or ice .