The description line is missing

The title is set, the headings are tidy, and the description tag is simply gone.

Where the description shows up

In a search result, the summary line under the title comes from the meta description. It does not move rankings on its own, but a well-written one earns more clicks. Skip it and the engine invents a snippet from whatever text it finds on the page, which reads fine now and then and often does not.

Writing your own snippet

Think of it as a short ad. You get roughly 70 to 160 characters to say what the page offers and why someone should tap it. Give every page its own copy; otherwise two of your results can wear one identical snippet. Do not stuff the line with keywords. Search engines mostly ignore a stuffed description anyway.