Not sure what could have happened, if device was powered off when QR was scanned, and boot mode was changed to LR and saved before powering up the device it should have paired in LR mode. If you tapped on the SS entry in the mobile app though, you may have accidentally set the boot mode back to Mesh before powering the device?
The mobile app only messes with the boot mode if you tap on the entry in the SS list to edit it. Otherwise it should not touch it. You can also update to the beta apps which I think both have LR boot mode now (although iOS may display it incorrectly). Both the beta apps are supposed to be getting close to a final release, they are working pretty good.
