Ornata Chroma V1 on Mac, Fn keys not working properly and Pause break not disabling?

Hi, I got my Ornata Chroma today and plugged it into my iMac (laugh I know, but im a Mac user) and I've noticed that my function buttons are all over the place, F1,2 and 3 work correctly (sound), F5,6 and 7 all work for rewind, play and skipG... but F11 and F12 won't adjust my brightness.... but what will adjust it is Scroll Lock (but only decrease, not increase) and *sometimes* Pause break... the other 90% of the time pause break just closes my Mac.

I've tried disabling it in the Synapse 2 app, which sometimes works and sometimes doesn't - does anyone have any idea on how to fix this? Keyboards great but not being able to adjust my brightness without having to go into my settings is driving me mad.