Hi @abdusalamk,
Thanks for reaching out.
Your website could have been a victim of the Japanese keyword hack. Google has written about this before:
https://web.dev/fixing-the-japanese-keyword-hack/
In their article, they also provide steps to fix this issue. It’s important to mention that this issue is not caused by our plugin, but it’s a problem with the security of the website.
You can also find more information about this on this thread on Google’s product support forums:
https://support.google.com/webmasters/thread/110960078/website-meta-title-description-change-to-japanese-on-google-search-how-to-solve-hacked-fixed?hl=en
Kindly check this, and please don’t hesitate to let me know if you have any questions.