绿卡申请材料被退回，紧急求助

我作为公民给妈妈(只她一人）申请绿卡，寄了I130和I485以及其他支持材料，加上两张支票 - $420 和$1070。今天所有东西被退回。

有两张FormI797C ，一张Reject I130, 另一张Reject I485. 理由相同，上讲：
The check amount is incorrect, or has not been provided. Please review the Form Instructions for fee information.Please resubmit the application/petition package with the appropriate fees to the address listed on the bottom of this page.

我支票title 写的是： U.S.Department of Homeland Security.

网上查了I130和 I485的Fee，没觉得错.

请各位大侠老师帮着看看！谢谢！