Yes, I am absolutely sure it's facing the right way, I spent an hour just sitting in the living room trying to figure this out & why only these command blocks specifically don't work. If you have any ideas to solutions that are as far from obvious as possible, let me know.
So, I managed to get the command blocks to work. Turns out, the repeating command blocks were too near to spawn? this bug has occured to others, in which repeating command blocks don't update in spawn chunks, even when set to 'Always Active'.
But The other problem with the chain command blocks appeared to be that I was activating two different command block chains with the same redstone block being placed in betwixt them... which still makes no sense at all to me. I don't know if this is a bug or intentional for whatever reason... but still, weird thing to need for working command blocks.