And the three preceding links are to http: instead of https:. They should all probably be domain-relative URLs (/2019/jsx-like-…, &c.).

author here, thx for pointing these out! I was simultaneously working on some CSS for my blog on localhost and when I looked up some references to older articles to put in my post, I looked them up in the version of my site that was running locally and forgot to change the links lol. Whoops. Fixed now — thanks again!