APK and Weird login screen

I created an apk and downloaded to android phone to test the app. We work remote so I had to let my users download the app in their android phones.

I created a login screen for a prototype we built. It works great on browser. and works majority of the time in the phone. But when app is open and phone goes to sleep mode and when we re-open the phone, it goes to weird login screen as below

This screen is no way related to our login screen.

Any one had this issue and please advise how to fix this…