Tweets: site url/’uncategorized’

Tweets work fine but it also tweets a random tweet which is the site url/uncategorized as in https://www.danzblog/uncategorized even though this category is excluded and there is no post or page called ‘uncategorized’. Where it the program getting this information?
Clicking on he link, predictably, leads nowhere, leaving me looking incompetent.

Possibly unrelated, some tweets with url link are the full 117 characters allowed with a link, others have as few as 11 characters with the link. No consistency here.

How can I make this work better/more predictably?