blog sidebar is at the bottom of the page in 2017

this post https://www.survivorshaven.com/2018/02/25/the-divinity-of-the-speck/ seems to have an unmatched </div> at the end of its content, possibly either from copy/paste or from editing the content.

check the content of that post, using the ‘text’ setting of the editor, to see if there is a </div> at the very end – if yes, delete it.

that was the problem – thank you so much! All is well now.