Possibly normal variations due to the time of day, ie first waking up from dark cycle, and maybe getting close to needing to be watered vs after watered? On the time lapsed videos of Nebula's grow, you can see the leaves "waving" up and down during each light cycle. It won't be that obvious in flower, but maybe the sugar leaves and even the calices wave a little bit during the day cycle.
You could set up a time lapse video camera, like a gopro, the next few days.
Very nice job!