Android apps are not using my wifi

[AC Question]

Some of my apps and games are not using my wifi! I checked the router...everything's fine apps like play store, youtube and gmail work fine but apps like whatsapp, hike, facebook, mobile legends, heroes evolved are not using my wifi. If someone has a solution please help.

 

[B. Diddy]

Welcome to Android Central! What happens if you turn off your mobile data on the phone. Do the apps use the wi-fi then?