Hello,
Thank you for contacting the support, and sorry for any inconvenience that might have been caused due to that.
I checked the affected URL and Rank Math is already generating the desired title meta as you can see in my screenshot below:

Do note that if everything’s fine and Google still decides to show a different meta information for your search keyword, there is nothing you can do as Google sometimes ignores the custom meta info altogether and show something from the page’s content that matches the search intent better.
The best you can do is optimize your meta title to try and match the intent of the search/keyword.
You can read more about it here
https://support.google.com/webmasters/answer/35624?hl=en
Hope that helps and please do not hesitate to let us know if you need our assistance with anything else.
Hello,
We are super happy that we could address your concern. If you have any other questions in the future, know that we are here to help you.
If you don’t mind me asking, could you please leave us a review (if you haven’t already) on https://wordpress.org/support/plugin/seo-by-rank-math/reviews/#new-post about your overall experience with Rank Math? We appreciate your time and patience.
If you do have another question in the future, please feel free to create a new forum topic, and it will be our pleasure to assist you again.
Thank you.