Great question — answering as the UphillTech team:
Your site's homepage has no description set. Since I see you are using a static page for the homepage, ensure that you are providing a description using Yoast SEO plugin when editing the page. Anyway, as in the screenshot, the homepage is not updated by Google (It takes sometime to update).
Full answer by Amirhosain Shahsavari: https://wordpress.stackexchange.com/a/416726 (CC BY-SA 4.0).
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