Hello,
Thank you for contacting Rank Math and bringing your concern to our attention.
I’m assuming that you’re referring to the <priority> tags in the sitemap. Please correct me if I’m wrong.
If so, we do not use that in our sitemaps. The <priority> tag is no longer needed or required when creating sitemaps. You can also check this image for reference from someone working at Google:

I hope that helps.
Thank you, and please don’t hesitate to contact us anytime if you need further assistance with anything else.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.