[primaeval]

I changed it to 1/1 and added couple of more schedules. All were recored at the expected time.

One thing I've noticed, when you schedule them and then alter after/before it won't reflect it on already scheduled jobs. But I still have no idea why some of them were kicking late. I'll keep digging.

 Good.
The job files are made either as soon as you make the rule, or on a daily update, with all the settings at the time it is made.
It was done that way so you could use an external scheduler when Kodi wasn't running.
However I have only got around to making it work for the external Windows scheduler.
It also limits the recordings to simple http streams instead of addon streams.