Android is replacing some of my app icons with alternative ones. How do I stop this Homtom HT30

The picture shows the icon for Google Maps.
The programs seem to launch fine but the icons are changed.
I was using the stock launcher 'Launcher3' which was overriding the Google Maps icon (and others).  A different launcher doesn't have this problem, and looks much better.  User 'beeshyams' suggested 'Nova Launcher' but I installed the 'Google Now Launcher'

Thanks 'beeshyams' for the answer.