I have some information that I want to share, MzJAS.
Once the page refreshes, this shouldn't affect the timesheet or the data entered should still be showing on the page. To prevent this, you can save them every time you entered more information. This is to ensure there wouldn't be any glitches and you won't have to start from the beginning.
Additionally, learn how to export approved timesheet data to QuickBooks for your reference. I've added this article for your guide: Export QuickBooks Time Timesheet Data To QuickBooks Online.
Please touch base with us if you need further assistance with your timesheet. We'll always be right here to help.