Adding subform instance - paging issue

Hi,

I have a form which includes a subform where one can press a button to add a subform instance.

The subform is located in the middle of the page, with a small subform below it. 

When I presss the add button to add the subform, the subform below the added subform goes to a new page.  I don't know why its doing this as there is plenty of room below the lower subform before the end of the page.

I recently added data fields to the form.  Before I added the data fields, when I would press the add subform button, the subform below would not go to a new page.

Any ideas?

Andrew