Had several rare pokemon run away while wife and son catch them

I have had Tentacruel, Starmie, Ninetales, Scyther, and a few others run away from me after a few failed attempts at catching them. Yet my wife and son standing right next to me catch them. Is there a glitch in my app? Why is it I am the only one who has these rare pokemon run away? Wartortle was another one.

Pokémon spawn are identical between different players in the area, but the Pokémon statistics are derived from your level.

If you are level 25 and your family is around level 5, your Pokémon will be potentially much higher CP, causing their chance to run away to go up.

In addition, the Pokémon running away is a random event so there also discrepancy between players due to randomness.