Previous page button should reset previous submited data

Im currently building a multi page survery and found that the conditional data to show a fieldset is not reseted once someone hits the previous page button.
The structure of the survery is like a 3 levels tree as folows:

First page: one fieldset with one select component containing several options.

Second page: one fieldset for each option of the first page select components, each of the fieldsets is shown depending on the option selected in the first page select compponent. Each of the fieldsets in the second page contains one select component with several options.

Third page: same as the second page but the fieldsets conditions depend on the options of the second page.

The problem arises when the user goes from page one to page 3 and back to one, then if he change the option selected in page one and advances again to 3, it will show the fieldset for the actual condition and the fieldset shown the first time the user navigated to page 3.

Page1 (option 1)-> Page2 (fieldset for option 1)->Page3 (fieldset for Page2 Option1 selected item)-> (previous page button) Page2 -> (previous page button) Page1 (option 2)->Page2 (fieldset for option 2)->Page3 (fieldset for Page2 Option2 selected item and Option1 selected item)

Is it clear?