Fastening is part of the manufacturer's installation system. A visible fastening problem should be evaluated with the surrounding shingles and substrate, not treated as a cosmetic issue alone. Adding more nails without a plan may create new penetrations.
What to do next
Ask the roofer to identify the installation defect and proposed correction. Request documentation where materials must be removed to inspect concealed fastening. Keep any repair method tied to the actual product rather than an improvised universal detail.
Related Perkins guidance
Contact Perkins Roofing to discuss your roof and the appropriate next step.