The answer to 'why is my flashing ice dams' is that ice dams can form along the edges of your roof, causing water to back up under the flashing and leak into your home. This is a common problem in colder climates where snow and ice accumulate on the roof. The main causes are poor insulation, inadequate ventilation in the attic, and warm air escaping from the home, which melts the snow on the roof and allows it to refreeze at the roof's edge.
Symptoms of ice dam flashing issues include water stains on ceilings and walls, peeling paint, and mold or mildew growth. Solutions include improving attic insulation, adding roof ventilation, and installing heat cables or de-icing systems to prevent ice buildup. In some cases, you may need to have the flashing replaced by a professional roofer if it has been damaged by the ice dams.