CUstom QGC app aligns with QGC in playstore

I am developing a custom QGC apk file . I am successful in creating apk for my custom qgc . But when i go to playstore , (i haven’t previously installed original qgc on my phone), the original qgc shows open (instead of the option “install”). When i click open my custom qgc opens .
Does anyone have any idea ?
And does anyone knows where i have gone wrong in coding ?