brake & front light issue Options

[JFG]

i have the euro light set up on the front of my car but i found an issue today.

all lights work normally on the exterior independently. today i saw my front side lights illuminate when i press the brake pedal, the brake lights come on also .
the only other quirk i have is that when i indicate left or right the 2 arrows on tje gauge flash once then stop but outside lights work as normal. these arrows work when i use the hazard flashers.

if i remember correctly i used a diagram from jeff bowlsby website for the wiring and i'm sure this has only just started as i've checked my lights numerous times

[JFG]

flasher relay is hidden above the fuse panel.

i rechecked the problem and it was just the front right side light illuminating.

both filaments on the rear bulbs work fine but i took both out and front light stopped illuminating.

i swapped the rear bulbs from left to right and then only the front left light came on.

again both filaments on both rear bulbs worked fine.

i removed the offending rear bulb (which was stiff in both sides whereas the other bulb was fine?) to examine it and the only difference is some blackening of the base of the filaments