Basically, in the Field App, you can have numerous surveys open at the same time. This typically happens when launching via a link. The only want to transfer to a different opened survey is by opening yet another survey via a link, or by closing/sending the active survey. This, in turn, shows the next survey in the "queue". The average user doesn't understand what's happening in this scenario because there are zero indicators that multiple surveys are open. When they are the same survey back-to-back, it's even more confusing.
Add a visual indicator to alert the user that multiple forms are open. And as a bonus, swap between these forms and close/save as necessary.