Is this a hack or cheat cod black ops xbox?

ok so here is how goes, enter new lobby and notice right away that about half of players are 15 prestige, so first match goes wonderful im on same team as all 15 prestige and we whoop butt i had the highest score, didnt bother looking at score board while match was happening cuz i knew i was kickin butt, ok so round ends and all of the other team backs out, 2nd round in this lobby begins, this time im on opposite team of the 15s they win while match is happening im checking score and notice that every one on my team is 1 or 2 bars while the 15s are all full i also notice that i seem to be a split second out of sync with the othe team but the game isnt lagging this goes on and on, every time im on the 15 team i have full bars and so do they but the other team has one or two bars and same when im on the other team everyone on there team has at least 3 bars an all of the 15s have full there were about 5 or 6 15s, i know this is a hack but how? and i wish to report them but will it be taken seriosly. and where do i report i taped some of the match so i have all the names what is this hack called it looks like a lag oh yeah and since all of the origanal players but me and the 15s left one of them was host because it never changed hosts after all the other platers rage quit