lemme answer why yellow got taller all of a sudden... the author needed to make them reunite somehow and this yellow kid thinks hes scared of big ppl, so if he became as much tall as his crush and when crush is in yellows house and if the family suddenly comes home yellow gotta run away right, and they are next door neighbors so obv author simply needed plot magic in it. that was just plot magic. ya shouldnt search for logic in series like these...