Why are all my meter readings rejected?

Every month when I submit my meter readings it’s rejected as not what you expected and I have to submit a photo ? The reading I submit is correct so why does this repeatedly occur

Hi there @Duncdevon it looks like we’d been told that your gas meter has an average consumption of 0 units per year-somewhat inaccurate. I’ve added your reading and redone your latest bill to take it into account, and hopefully the next one should go in a little better