Google won’t always use your meta description—even if you’ve set up everything 100% correctly. Sometimes, Google will pick a short section of your post that it feels is a better match for the user’s search intent.
Of course, you should always make sure your meta description is well-written and accurately describes your page content. That’s what my tool helps you with
Beyond that, there’s nothing you can do to prevent Google from changing your meta description in SERPs (search engine results pages). Personally, I try to see it as a good thing: Google wants people to find and click on a result, and so by rewriting your meta description, it’s aiming to improve your CTR (click-through rate) and get you more organic traffic.