Been using a bank of 8 leds for testing (I’ve checked the connections a hundred times).
Tried diffferent DOUT boards, different SR’s. Always the same.
It’s been about 18 months since I tested with a multimeter though. I’ll check it when I’ve got a few minutes to breathe again
I’ve always just dealt with it, till now when I fkd up a custom pcb for relays. fixed by swapping pairs on the ribbon cable around, but it hit me that it didn’t make much sense (nothing did 18 months ago :D).