I experience a similar problem sometimes. However I'm guessing you're talking about your Dark Blade's Spite on your Titan. I've felt like that Fusion Rifles are currently broken in their hit detection. Like shots from my Thesan FR4 do 49 damage each and there are 7 projectiles. 49x7=343 damage. I'll shoot them within the correct range and full stability... and only 3 of the shots register.
However it seems the Damage Referee only effects yellow bar players and Destiny's weird match making algerithm seems to put players on the other side of the planet in the same match room. So by the time the data is processed and has gone through, they've already killed you and two other players XD.
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Actually I was using a DIS-43. It's like bullets would hit, it would even show the player flinching, but no damage recieved by the player.