Both Trailer Lights Blink With Turn Signal Any One Have Info On Brake Lights On My 97 Silverado?

Any one have info on brake lights on my 97 silverado? - both trailer lights blink with turn signal

Ok here we go with the truck running and the lights I turn on the brakes and they work well. But if I have to flash to the right or left, and press the brakes, all lights start flashing in the background, i even light plate between the two plates of all the bulbs with marker lamps for all lp I changed the Blinkerbirnen penut I brake switch for the reasons I looked lost and no more reckless followers oi UEL even changed the headlight switch could be the multi-selector Ingition IV or someone working the help of cars for years, but it really fascinates me, I have a doner truck parts exchange thought id ask before going into the IGN switch or multi -