Is it normal that I need to fill in my email address and phone number in the app during an update?

Yes, this is normal. Some users are using the Payconiq by Bancontact app, but did not yet create a profile in the app. Those users will need to enter their email address and phone number, have them validated and confirm with their pin code. If you already have a profile, you will only need to confirm with your pin code. 

Just follow the steps in the app. It will only take two minutes.