How to fix Auto-Correction issues in Pages app

I've been using Pages app for a while now and It has been a blessing for me as I could write all my documents seamlessly. But there's some issue appeared with a feature which is with "Auto-correction".

I try it in the pages settings where it says "Correct spelling automatically" and this option is also Checked but when I start writing, it just completely ignores the feature of auto-correction.

It is getting on my nerves and I can't resolve it. If someone know how to solve it or if it happens to you as well, please guide me on this.

[Edited by Moderator]