I've noticed it also. We were following a boat towing a tube in the narrow part of Alton channel just after Sandy Point and a rider fell off.
Pretty dangerous in traffic, plus then, I slowed down forcing others behind me to also. Honestly, I wonder sometimes how much thinking goes on here. Another thing I've noticed often is boaters pulling tubers, heading towards us, will suddenly deviate from their course and swing around forcing me to change my course or even come off plane because sometimes you can't always tell the line the tube will take. Super observant is the word of the day.