It Doesn't Add Up

Doing corrections today with the PIG's, all three had the same wrong answer for how many seconds are in three minutes - 177.  Puzzled, I asked if they cheated off one another.  Denying any wrongdoing, Grace says, "Look, Mommy, I will show you!"  She holds out her wrist and says, "See, my watch changes minutes after getting to 59!"  LOL!!!  :)