Turn signals not flashing

I have 72 demon with an American auto wire harness on the car. I also have digi-tails in the tail lights. With key on and engine off the turn signals flash normally and the emergency flashers work perfect. But With the headlights on, I can hear the flasher relay click slower and the front turn signals don’t flash at all, they just remain solid. The element in the bulb that flashes doesn’t remain solid, just the parking light element. I have tried changing my tail lights back to standard 1157 bulbs doing away with the digi-tails, made sure all grounding points were clean and also ran a ground straight from battery to the turn signal ground and none of that fixed it.

Has anyone else ran into this problem? I would assume the switch in the steering column works correctly being that it flashes perfectly with the headlights off. Thanks