The answer to 'why is my roof vent curling shingles' is that the heat and moisture escaping through the roof vent can cause the surrounding shingles to curl and lift up. This is a common problem that can occur when the roof vent is not properly installed or sealed, allowing hot air and moisture to escape and damage the shingles.
The curling of the shingles around the vent is a symptom of this issue, and it can lead to further roof damage and leaks if not addressed. In many cases, this problem can be fixed by a roofing professional who can properly seal the vent and replace any damaged shingles. However, in some cases, the vent may need to be relocated or replaced entirely to prevent the issue from recurring.