Aran Damage Range

Polearm mastery looks broken. It looks like it's only ~35% instead of 60%. Glitch?

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No, mastery does not make your lower damage 60% of your upper damage.
Random example, 400 str, 4 dex, 100 attack.

Minimum Polearm = (STR * 0.9 * 3.0 * Skill Mastery + DEX) / 100 * Weapon Attack
= ((400*0.9*3.0*0.6+4)/100)*100
= 652 minimum
Polearm max = (400 * 5.0 +4)/100 *100 = 2004
652/2004= 0.33, or your minimum is only 33% of your max.