Single page excel grows into multiple pages when sharing with others

Hi, I am working on an urgent project of creating a form for a client. I use excel 2011 mac and my client uses 2008 mac.

I delivered the work as a single page excel, but my client said the form expands to multiple pages on his screen. Please see attachments.

I asked him to adjust the margins and that did not solve the issue.

I noticed from his screenshot that all the column widths and row heights were enlarged for some reason. I asked him to send back the excel he opened, and the file opened issue-free on my screen.

I don't have access to excel 2008 and cannot duplicate the problem on my end. I tested the file on excel 2010 and it opened as single page. However I am not confident enough to suggest a version upgrade to my client. What if he spends the money and the issue remains?

Is there a fix that I can do so the form stays single page in all versions, or at least on his version?

I am supposed to offer a solution within 24 hours and am completely stressed out. Any help is appreciated!!!!! Thank you.