it happens sometimes
for some reason, many friends of my parents who are from the same country as us are really short but MOST of their children outgrow them a lot. Like their mothers are 5'0-5'2 and their fathers are 5'3-5'5 yet their children who are grown up become around 5'4-5'9 (girls) and 5'8-6'0+ (boys). I know those heights aren't incredibly tall but they are in comparison to their parents' heights. Children who are still in primary school are even taller like they're already reaching and surpassing their parents. There was this 12(?) year old girl my parents knew and she was already 5'8 (her parents are short). Don't know why or how, probably because the lifestyle and diet is much better here in the UK than in our country. Unfortunately it didn't happen to me, wish it did though