how can I turn my headlights on?

Renault cli 1.4 2006, I cannot turn on the headlights on properly as when I turn the steering right and left the right and left headlight turns on but again they are off when driving straight.
The only thing I have recently done was changing the upper rear brake light bulb.
I am confused as the headlights did not have this problem straight after changing the upper rear brakelight bulb.
Thanks if you let me have your advice.