Hey Amy,
I’m sorry to hear about these changes! A combination of our plugin’s own CSS changes and some CSS on your theme could be causing these notable changes in display—I’ll take a look and try to recommend a fix for this!
To help with that, can you do the two following things?
1. Share a link to a page on your site with the oddly-displaying Event List Widget.
2. Share your system information with us—here’s how to do that: https://theeventscalendar.com/knowledgebase/sharing-sys-info/.
Thank you!
George