WhatsApp Group Creation Fails & "Unofficial WP" Error Triggers

While trying to create a group (consisting of 5 friends with no different numbers), the application suddenly gave an error and logged me out. I submitted a review request after being spammed. After 7-8 hours, it was realized that there was confusion and the login screen opened again. I entered my number, but before the code arrived, I got the error "You are using unofficial WP." I don't use any APK other than the application from the Play Store. When I enter another number, the code is sent to that number. I don't know what happened or how it happened, but this needs to be fixed. I have been checking the platform since yesterday, and many people are suffering needlessly.