brake light problems!

[Cupra-jb]

iv got a major issue with my lights on my o3 lcr.

the problem is that when i put my side lights on all the brake lights stay on and only go off if i turn the lights off?

and when the lights are off if you push the brake pedal the front left side light comes on aswell as the brakes?

so i went and bought a brake light switch thinking this was the problem,so i swopped it over but no luck?
,now iv tried swapping the switch as soon as you plug the switch in you get the annoying side light beep even though there not on,and the brake lights are on all the time?

so iv had to unplug it for now untill i find the issue?

can any one please please help me as i have no idea what it could be?

many thanks.

 

[Muttley]

Stop/tail light bulb in upside down?

 

[techie]

Yeah bulb is either wrong or in upside down and its back feeding.