Starting with round 15, the trigger for the event is incorrectly set to "The clock ticks" instead of "A level starts". This means it will fire with every tick of the clock so long as the conditions match the current tournament state, and since the conditions are "roundNum = 15", they will match for the entire level, so it will fire at every clock tick during that level.
So, for the following events, change the trigger to "A level starts":
350 & 700 Blinds
400 & 800 Blinds
500 & 1000 Blinds
1000 & 2000 Blinds