Hello,
Thank you for contacting Rank Math and bringing your concern to our attention. I’m sorry for any inconvenience this issue may have caused you.
Could you please also share the affected URL to check this issue further?
Thank you, and looking forward to your update.
Hello Reinelle, i have solved the issue by unchecking addition of alt in the image, however, the sitemap generated by rankmath plugin does not contain images. Here is the link https://bicity.reviews/sitemap_index.xml
Hello,
To include images in the sitemap, please head over to Rank Math > Sitemap Settings > General > Turn on Images in the sitemap, if you want to include featured images turn that option on.

I hope this helps. Looking forward to helping you.
Yes everything is okay. now thank you
Hello,
We are super happy that this resolved your issue. If you have any other questions, 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.