title: Square boxes appearing on websites in Google Chrome
body: <p>These square boxes have been appearing on the websites that I've worked before.
  They show up in the middle of the text randomly.</p>
  
  <p>All the sites are in Wordpress but have different themes and different hosts.
  But it only shows in Google Chrome. My Chrome version is 56.0.2924.87.</p>
  
  <p><a href="https://i.stack.imgur.com/cm2CE.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/cm2CE.jpg" alt="enter image description here"></a></p>
  
  <p>Does someone know what is going on or how to prevent this?</p>