InfoPath Dev

Hello I am currently working with a sharepoint/infopath database. The problem is the database alreadys has forms published to it but when a change is made to a repeating section that is already in the form. (We are using a repeating section and default values to create a table with checkbox options)...

I have a repeating section and under that I have 3 sections and a dropdown. I want to show only one section at a time on a selected value from my dropdown. This stuff is done successfully, but the space or size occupied by my repeating section remains same even after the other 2 sections are hidden....