High Level/End Game Creep Issue

I've discovered a very troubling end game problem. I does not present itself until someone upgrades there creeps through the citadel. More noticable if someone captures a Minion +30% flag then it is recaptured back. This will trigger the recapturers creeps far above the other players creeps health. I've tested this with a friend to ensure we both had the same ammount of upgrades armor wise on our citadel... at End game we both had max hp Giants and I capture his flag then he recaptured back. This offset our minions HP about 600 HP as well as strength I'm sure. I've brought this up with many players and all have identified some kind of false calculating somewhere... Who all else has noticed this problem please notify here and perhaps we can have this looked into.