Expenses going missing from Fusion Expenses app

Hi,

We've been using the Fusion expenses app for approximately a year now but in the last few weeks we've had two separate instances where users have saved expenses on the app only to log back in to submit them and find that they had disappeared. These users had previously submitted multiple expenses without any issues. Both were using the iphone app and I know they had upgraded to version 6 quite recently. Has anyone else had similar issues and if so any idea why it is happening?

Alternatively does anyone have any suggestions as to how to retrieve these expenses as they obviously haven't been transferred to the database as they hadn't been submitted.