erm i think i have spotted the problem tho i am not certain however if you look down at the 'dying unit' part, by the time that has executed the dying unit could be a differant unit, like this: i kill spider, wait 99 seconds it comes back.
i kill a spider, then a gnoll, wait 99 seconds, gnoll comes back. you need to save the dying unit in a variable the variable should then increase so each one i unique you then also need to remove the variable once it has respawned. also your locations leak, i shall show you what u must do here:
Lets just be very simple here: Dont use a trigger, to revive simply give the desired resawning unit ank of reincarnation if you want it to respawn then use a trigger to add exp, money and what not
if you want these units to be on another persons side but not respawn then make a dublicate unit, somehting like that would be like this in a trigger to give gold and whatnot:
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Last hitter setting
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Events
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Unit - a unit is attacked
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Conditions
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Actions
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Setvariable(last hitter) to (attacking unit)
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exp and gold on 'kill'
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Events
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Unit - a unit starts the effect of an ability
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Conditions
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Ablity being cast equal to revival
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Actions
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Unit - add (amount of exp that would be earned using a formulae eg. level of unit x 10/ number of units equal to unit type of matching unit equal to (your heros) within so much distance of triggering unit and owner of matching unit not equal to owner of unit triggering unit
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Player - add (so much gold or lumber to owner of unit (lasthitter)
I shall now give an example of what this will do:
example:
5 ghouls, two heros vs a footman
everytime a unit is attacked it becomes the 'last hitter'
as no unit can attack at exactly the same time it will always be one unit.
footman is 'killed' so the effect of the revival abilitiy is activated
then the exp is added, lets say a footman gives 100 exp, unsing my example formulae it means the footman was level 10.
as there are two heros next to him the exp is devided by two, so both heros 50 exp each, then the resources would go the the 'last hitter' witch ofcource would have been the unit witch killed the footman, then 99 seconds later the fotman would be revived.
Wait 99.00 seconds
I maked those mobs not equal cuz they are quest mobs! 
