Thanks.
Yeah, it was on 4. I also tried taking them all out and putting them back in sequence.
I also tried them all in the first one, one at a time.
I'm going to try different cables tomorrow, see if that helps.
I unplugged the 4th one, switched it back on and the 3 in the front came back on, there's a high chance this was just coincidence though. I've not turned it back off again yet, as I'm enjoying the lights for the time being (the reason I bought this case)
also I can't change the lights via the app. it recognises the hub, but it won't let me change the lights.
There's definitely something up, I just have no idea what.