The answer to 'why is my ridge vent' is that your ridge vent may be clogged, damaged, or improperly installed. Ridge vents are an important part of your roof's ventilation system, allowing hot air to escape and helping to regulate temperature and moisture in your attic. Common issues include debris buildup, cracking or splitting of the vent material, and gaps or improper sealing around the vent.
If your ridge vent is not functioning properly, you may notice signs like uneven heating and cooling, increased moisture or condensation in the attic, or even roof leaks. In some cases, the vent may need to be cleaned or repaired. More serious issues may require replacing the ridge vent entirely, which is best done by a professional roofer.