Image Display on Mobile Device

Good morning,

We have a question about our weekly newsletter.  In the desktop view, each "article" has a picture on the left next to the article title.  However, in the mobile version, all of the pictures appear above the title (which is fine for us), but some are centered and some are left-aligned.  We've tried to figure out why so that we can change them to all be centered, but so far have been unable to identify the reason. Can anyone provide some insight on this?  Thank you!!