Double meta description

Hello @hungryinthailand,

Thank you for contacting Rank Math support, and sorry for any inconvenience that might have caused.

If you are using the Hello theme then you need to check this topic:
https://www.ads-software.com/support/topic/duplicate-meta-tags-7/

The theme developer has to fix the issue on their end and add compatibility for all the popular SEO plugins.

If you are using some other theme, then assuming you are using the latest version of all the plugins and the themes (please update if not yet), to determine that, please follow this troubleshooting guide:
https://rankmath.com/kb/check-plugin-conflicts/

Here is a video you can follow as well: https://www.youtube.com/watch?v=FcIWRhcUP2c

Only the site admin would know, and this troubleshooting won’t affect your users.

Hope that helps.