There are a number of possible reasons why this might be occurring on only one section of your roof. These include:
The shape of your roof and prevailing winds -- some roof configurations concentrate wind loads. This combined with the orientation of your house and the prevailing wind direction during high wind storms can cause localized damage in one area of a roof.
Your single masonry chimney -- its location can sometimes add to the phenomenon described above.
Amanufacturers defect -- it is possible that one or several bundles of shingles on your roof have inadequate self sealing adhesive on the shingles. This would prevent the shingles from sticking together which provides significant wind protection.
The pitch of your roof -- if a section of your roof is steeply pitched, the shingles are less likely to adhere to one another.
Installation defect -- depending on the size of your roof, there may have been different roofers working on different areas. If the shingles were incorrectly nailed or stapled, the shingles can be more prone to being torn off. Sometimes, nails or particularly staples are driven to deeply into the shingles which can cut them and create weak spots. Nails which are not driven far enough prevent the shingle above from making good contact with the self sealing strip on the shingle below.
Your inventory suggests that your home was built in 1997. If your house were new, the problem might be related to shingles installed during cold weather. In a home the age of yours, the shingles should have had ample opportunity to heat up during summer months and seal. This may not be true, however, with replacement shingles. In the future, when reroofing, you might consider using specially designed high wind shingles, or at the very least consider having the roofer use six nails (not staples) per shingle in this area and add additional adhesive material to secure the shingles.