HP Prime Android Application (2016.12.08 1.3.1.11226) is clearing user apps/programs

[chromos]

Nexus 6 phone with Android 7.0

I tried more than twenty times "switch-off" my HP Prime with triangle or circle softkeys without [Shift] [On] and no strange behaviour. No data loss or anything else after killing HP Prime at running apps in "square" menu of the phone. But after rebooting my phone I lost everything from the calculator including Settings. It seems the calculator is in factory default state after reboot. This is not much good for any work. :-(