Bad RNG
so this thread explains how the TM bonus works:
https://forums.galaxy-of-heroes.starwars.ea.com/discussion/94465/how-is-tm-boost-at-beginning-of-match-calculated
Maul is giving 20%... so count that as those characters all start at a pool of 200
you start at zero.
Turn 1... D=391, M=363, P = 333 You Poe=218 R2 = 208
Jumping forward to turn 5 the TM is at:
D=1155 M = 1043, P = 923 (This is confusing at this point because you said that 3 of them went first... that I'm not sure how happened, may be another TM mechanic at use
you are at
Poe= 1090 R2 = 1040
So 4 characters are set to take a turn. It's all RNG at that point and Dooks and Maul both won that dice roll.
So that's why 2 of them went first... if you are accurate and a third went first at those exact speeds, Can't really explain that. I'm willing to bet that you're incorrect about Palps speed as he's only +10 off base... and someone running a Zmaul team would probably have him higher than that... but again, can only work with what's given.
Look up Team Instincts how speed works guide as well.. really helpful.