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i think the flash hitting the shoe and the rope is causing the issue. because these are brighter than the faces the eye is drawn to these details instead of what the photo is really about.
jack up your ISO, forget the flash, shadow recovery in post
or something like that. i think your overall composition is less of an issue than the use of light. think about controlling the viewer's eye, drawing them to what you want them to be looking at. the shoe and rope are great for context, because we know what these kids are doing, but they're not the subject of the photograph.