Hello,
Thank you for contacting Rank Math, and sorry for any inconvenience caused.
I checked the page source, and the title is added correctly to the page source.
It is a pretty common thing with Google these days. It happens with 70% of the results.
Google has made some changes to its algorithm which automatically changes the titles, discarding the one you have set in your SEO title meta tag. This happens regardless of the SEO plugin you are using. We have covered this Google update here:
https://rankmath.com/google-update/google-title-rewrite-update/
Hope that helps and please do not hesitate to let us know if you need our assistance with anything else.
