Canonical urls created that don’t exist

We are seeing canonicals showing on many of our posts that are non-existent urls. They are not being set in the Yoast settings, or in the Permalink plugin we are using (Permalink Manager Lite.) The page above shows this in the source code:

<!-- This site is optimized with the Yoast SEO Premium plugin v16.5 (Yoast SEO v16.5) - https://yoast.com/wordpress/plugins/seo/ -->
	<title>How the Huskers Let One Slip Away at Northwestern - Nebraska Basketball | Hail Varsity</title>
	<meta name="description" content="After rallying to take a late lead at Northwestern, Nebraska gave up a go-ahead bucket with 2.7 to go. Jacob Padilla broke down what went wrong for the Huskers." />
	<link rel="canonical" href="https://hailvarsity.com/basketball/how-the-huskers-let-one-slip-away-northwestern/" />
	<meta property="og:locale" content="en_US" />
	<meta property="og:type" content="article" />
	<meta property="og:title" content="How the Huskers Let One Slip Away at Northwestern" />
	<meta property="og:description" content="After rallying to take a late lead at Northwestern, Nebraska gave up a go-ahead bucket with 2.7 to go. Jacob Padilla broke down what went wrong for the Huskers." />
	<meta property="og:url" content="https://hailvarsity.com/basketball/how-the-huskers-let-one-slip-away-northwestern/" />
	<meta property="og:site_name" content="Hail Varsity - Nebraska Football, Recruiting, News" />
	<meta property="article:published_time" content="2021-03-08T14:00:10+00:00" />
	<meta property="article:modified_time" content="2021-03-08T14:25:47+00:00" />
	<meta property="og:image" content="https://hailvarsity.com/wp-content/uploads/2021/01/JP210110_0232_Indy_v_Nebraska-1-scaled.jpg" />
	<meta property="og:image:width" content="2560" />
	<meta property="og:image:height" content="1707" />
	<meta name="twitter:card" content="summary_large_image" />
	<meta name="twitter:creator" content="@JacobPadilla_" />
	<meta name="twitter:label1" content="Written by" />
	<meta name="twitter:data1" content="Jacob Padilla" />
	<meta name="twitter:label2" content="Est. reading time" />
	<meta name="twitter:data2" content="6 minutes" />
	<!-- / Yoast SEO Premium plugin. -->

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