margin different from first page to another page when print

I work in report rdlc i face problem the top margin of matrix control different from first page to another pages

meaning

if starting of showing data from first page is start from 2cm from top of page

in another pages it start from 0.5 cm from top of pages ?

why this problem happen and how to solve it

according to my design rdlc first page is same design

but another page top margin starting not accurate my design

How to solve this problem ?

my design is contain matrix control inside it rectangle control ?

see image below it describe my problem

image have design view and different between first page and another pages in top margin