car is sunny a12 round headlights

the car have 4 lights (red tailights)

the problem is when you turn the headlights on these 4 lights light up but the inner lights are dimmer than the outside light (all lights should have the same brightness) THEN when you press the brake pedal RHS brake lights go off, LHS works OK.
When the headlights are OFF brake lights work but RHS is dimmer than LHS
Any ideas?

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RHS = Right Hand Side
LHS = Left Hand Side