Deleted article redirecting to older article/post

Hello! Can anyone help me with this? This problem makes my head hurt! Here is my problem:
I deleted an article because of low traffic and wrong keyword choice. Let's say the post title is "best widget". I also deindexed the article using search console.

After I deleted that post, it automatically redirected to an old article "best widget for kids". I didn't do anything for it to redirect. WTF?! I even tried to redirect the deleted post "best widget" to my homepage using several plugins, but…

Deleted article redirecting to older article/post