new stanton i track 2 rs carts


I just got some new ones, but they keep skipping and one of them is distorting the sound. is this normal or should i be thinking of sending them back to the shop.

i have pro 150 decks that are atmittadly 9 yrs old but should this matter, and i have been altering the counter balance on the tone arem and i think the anti skip on my deck is just there to look at ( its not connected to 'out) but they still skip and sound fuzzy. do they get any better ?can anyone help.