Can't select default calendar other than Outlook

So I'm not able to select the default calendar other than Outlook when I tap on events. I was able to select default for creating a new event but when I tap on any event upcoming in the calendar it asks me to select Outlook as default or just once but I can't select Google calendar as always which is what I want to do. I've tried clearing defaults but still doesn't work I don't want Outlook to be my default calendar I want to select Google calendar as the default when opening.