Diagnosing URL sequence gaps in sitemaps

Why does my sitemap shows this huge gap from 2845 to 6011? I’m not sure why it’s like this.

<url>
    <loc>https://example.com/t/can-vitamin-b-be-dangerous-if-taken-in-large-bla-bla-bla-bla/2845</loc>
    <lastmod>2025-05-16T14:13:32Z</lastmod>
  </url>
  <url>
    <loc>https://example.com/t/one-small-win-at-a-time-nosleepclub/6011</loc>
    <lastmod>2025-05-18T10:37:33Z</lastmod>
  </url>