Smartforms - Size of Main Window

Hello Experts,

I need some help in Smartforms.

I am displaying Invoice in Smartform. When I display the Invoice, an additional empty row gets added in main window for first pages but not in last page. This happens only for some invoices.

I think this is because, for the items for which it does not fit in the size, it gets into next page, but the border gets drawn for the Mai window showing an Empty Row.

Can you please help as what could be the reason.