Data merge: Create Merge Document/PDF export problem: size change

Hi everyone,

So, I got a problem while exporting merged data to pdf. I made a frame using frame tool, and set fix parameter: hight, lenght... After merging to pdf and printing, the size of frame has changed. When I printinted single example without merging, everything was OK. Data Merge preview also shows proper sizes. That make me think that the problem appearce while data merge and exporting to pdf. I tried to cachange different parameters in section Create Merge Document/Options, Create Merge Document/Multiple Record Layout but nothing helped.

Will be greatuful for any help.