Rank Math SEO’s meta description, author and keywords not visible

Hello everyone,

I have added meta title and description on this page but it’s showing empty.

<meta content="" name="description"><meta content="" name="author"><meta content="" name="keywords">

The title and description that I have added are coming like this below which is not detected as meta title and description.

<meta property="og:type" content="website" />

<meta property="og:title" content="Rg Creations Nepal : Best Construction Company In Kathmandu Nepal" /><meta property="og:description" content="RG Creations Nepal: A premier construction company in Kathmandu, delivering top-notch construction services designed to meet your unique needs." />

So, how can I make this as default meta content and description? Also, from where I can add author? I am really stuck at this point and searched but wouldn’t find any solutions that worked.

Thanks in advance.

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