Strange break light problem

So after replacing both my rear break lights yesterday now when I push my break the dipped headlights come on... anyone knows what’s gone on here?

Edit: Should probably add the breaks do work now though!
Just checked the bulbs against those In the emergency spares, different filament. :oops: Really should've checked that before assuming something worse, all back to normal now!
Aye the problem was the same issue I had with spark plugs, the bloke in Halfords handed me the ones for a newer model by the looks of it, only had one filament, not 2.

Those spark plugs were a right bitch, thought I'd blown a coil and my brother had chucked the old ones out. Had to swap the ones out of my car to check.