Question about arrears

I live out of state and just had a phone conference about my child support. 

My children live in Bucks Co, PA so the case was handled there.

 

My child support went up $18.00 a month, but I was told to pay over $1300 in arrears. 

 

I have been on time with all my payments because it gets taken out of my check. How are arrears determined and why should I pay all that money?

 

Thanks in advance.

 

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