Zadamster

I purchased 3 guns for my boys and I for X-Mas. My oldest son a Tippmann 98 and the others were an Eradicator for me....to have something economical to play with and a T-Storm for my other son who will just shoot in the backyard. We went out this A.M. and both the T-storm and Eradicator chopped balls like crazy. Cleaned them and went back out and same thing. Am I using the wrong balls or something? Using scenario Series Xballs. We are new to paintball.