Hi,
I wanted to share this in case anyone else was coming across the same issue I had. I have just moved my Hue bridge integration from the built-in version to CoCoHue (mainly because I wanted the ability to activate 'flash' on a HSM event), however a handful (4) of Hue devices started coming on at 1% when the on command was sent (the device status reported 100%) - this was a mix of Hue RGB candle bulbs, E27 bulbs and a Lightstrip. What this resulted in was a very dark room when lights activated by motion were meant ti come on (I preferred using the 'turn on' command, rather than 'turn on and set level' because if the bulbs were manually dimmed it meant they didn't return back to default brightness on the next motion event).
After a lot of troubleshooting I found that the 'Off transition time' setting on each of the bulbs was set away from the default option, after changing them over to the defaults setting the bulbs started working as expected:
I think it might just be a bug (as I didn't change the setting away from default in the first place), however I thought it was worth sharing in case anyone else has a similar issue and then comes looking on the forum (like I did) for a fix!