Housing in this service area was built mostly between 1953 and 2014, with the bulk of it going up through the 1980s and 90s. That means a lot of doors out there are original builder-grade steel sections, often thinner gauge than what's sold today, and after a few decades of North Texas heat the steel has gone through enough expansion and contraction cycles that panels warp, seams separate, and the finish gets brittle enough to crack rather than flex on impact. In a moderate-heat climate like this one, the door's south- or west-facing side usually shows it first - the panel that takes direct sun all afternoon is the one that bows. On older doors from the earlier end of that build range, we also run into panel profiles and bolt patterns that aren't made anymore, which limits whether a single-panel swap is even possible versus replacing the full door. That's not a defect in your door, it's just what happens to builder-grade steel over 20 to 40 years in this kind of heat.