[TKCR]

It’s because the new ones are not pinned correctly. The couplers need to be pinned to match the new lights. I even had to do that with my Holley lights, but at least they came with instructions on how.
When I bought mine, it was a 1 day pre Black Friday sale last year. It was a buy 1, get 1. So in the end, I paid for 2 lights and got 2 lights fee, plus the instructions. Trying to located them, I post it when I find it.