My firebase storage rules keep changing to default one

I have built an mobile app & web app for my firebase storage/bucket to view my storage data. The security rules I have kept are read and write for all users but after some days it gets back to the default security rules. My storage is also in "production mode". Can anyone guide me on why it keeps happening?

rules_version = '2';
service firebase.storage {
  match /b/{bucket}/o {
    match /{allPaths=**} {
      allow read, write;
    }
  }
}