Help with lights!!

[danny6892002]

I need help!!!! Am having trouble with the brake lights, if I press on the brake pedal both lights come on but when I use the passenger blinker the driver side brake light turns off. I just don’t understand why. If I turn my headlights both blinkers work fine. The only problem is when I press the brake and only when I use the passenger side blinker, if I press the brake and use the blinker to make a left turn my lights work perfect.