UPDATE: December 10, 2015
This isssue happens when there is an auto refresh on the page. If you are experiencing this issue with your form - i.e. the form data clears when the window is resized or the form data clears on a tablet or iPad - then notify us immediately via Help Desk ticket. We simply need to remove the page refresh value.
ORIGINAL POST: Octboer 8, 2015
We have recently been made aware of an issue with the Formstack forms and Firefox browser. When users are fillng out information on the form and using the Firefox browser, if they go to resize the browser window, all data entered will be lost. Formstack is currently looking into this issue and will provide a fix once it has been solved.