Use of Multiple Landing Pages and Custom Fields

Hello, I have multiple landing pages available from an email. The use may decide to use both landing pages. Each landing page has a few different custom fields. It appears that data is carried over between landing pages. In other words, a field that is needed in one page, ends up in the second page with the data used in the first landing page. This will make downloading of spreadsheet data confusing because of the duplication of data across landing pages. Is there a way to ensure initialization of custom fields when each landing page is loaded/entered?????