Do I need to get it fixed, Is there something wrong? What kind of price am I looking at? Im under warranty
The weights are installed at the side of the rim opposite to high weight spots to offset disbalance. There are two types of balancing: static and dynamic but only dynamic produces real results, and it requires special equipment tire shops have.
When you have you tires balanced they spin the tire with the rim on and see if it spins with out wobbling. Then they place counter weights on the rim to help the tire spin with out wobbling. The weight is small and just clips onto the rim
There are little balls in the wheel well that help keep the balance of the tire even. After driving on the same tires for a while, the balls can move around causing it to become unbalanced. You have to have a special machine to have them balanced, so you should take it to a tire shop. It's generally very inexpensive.
Check the owner's manual - It could be a system that you can program to go the way you want it to.
