How did Hitmonchan outspeed Mawile when I picked Sucker Punch?

Question

Sucker Punch is suppose to outspeed any move but Hitmonchan's Mach Punch got to go first when I picked Sucker Punch I think it Glitched.

Answer 1

When two priority moves are used in the same turn, it would work like any other speed battle. Whoever is faster gets their priority move to hit first.

Answer 2

Sucker Punch and Mach Punch each have a priority of +1, because Mach & Sucker Punch have +1 priorities it acts like a normal turn and bases who goes first of speed stat, speed stat increases & decreases, and abilities (Like a normal turn.)

EDIT: Hitmonchan does have generally higher speed stats (Min. 141 Max. 276) while Mawile's speed stats are a bit lower (Min. 94 Max. 218.) P.S. The ranges show are on a Lvl. 100, Beneficial natured, 252 EV, 31 IV(Max values.) While the minimum stats are on a hindering natured, Lvl. 100, 0 EV, 0 IV.Mawile's Speed, Hitmonchan's Speed, Sucker Punch's Priority, Mach Punch's Priority