WordPress plugin Rank Math SEO is not supporting metas

I’m uploading blogs over this website but the rank math is not supporting meta when I insert meta it proceeds to update the blog and after i reload the page meta disappears even after updating. the theme is tranzkart cargo theme here is the link to the theme: https://preview.themeforest.net/item/tranzkart-transportation-wordpress-theme-for-logistics/full_screen_preview/46062806?_ga=2.260566541.1862394809.1702422263-508101217.1702422263

Just want to know what could be the reason behind this.

The page I need help with: [log in to see the link]