Annoying 'Done' screen after tapping call button on iOS

Hi guys,
I hope you can help with this one. I’ve scoured multiple different google searches but nothing seem to come up which leaves me feeling like ‘Is this ONLY happenning to me!’… surely not. OK so I have set up my app which has an awful lot of Call Now buttons throughout and whenever you tap on a call button (iOS only) it brings up the prompt to make the call but the PWA app in the background flicks to a blank screen whereby you have to tap ‘Done’ in order to go back to the app. Please help! Cheers.