Print invoice question

Hi there, im wondering why when i go to print an invoice, the information i have in a sub table has missing product lines.  If i click on print pdf, all the product lines are there which is fine but it seems like i am missing products when i click on print.  I have tried changing the size of the table but i can't drag the bottom down to make it large enough, it just doesnt resiz properly?  Any idea whats happening here?