Nest 2 is a much smaller nest than Nest 1. Whilst not as cramped as it looks from the nestcam angle it is still not spacious for three youngsters to flap and jump. This can lead to some uncomfortable moments for napping ospreys.
All three chicks are flapping their wings for 30 seconds or more, accompanied by hops and jumps. Quite often the jumps are onto the nest edge.
Better than still images, here is a link to a video of the three young ospreys.