Likely the VERY short duration of the debuff effect. You're better of with Fusion 'nades, as they can apply the debuff twice with one grenade.
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Edited by KNIGHTofLIGHT I: 10/27/2016 5:11:15 AMThe solar puts it on all 3 times. It burns the enemy and does DoT dmg, it has DoT already on it, puts one (up to 3) stacks.