Help with strange “warning” above all my header photos

Hi everyone!

I have had my site running fine for over a month now and suddenly see the following above all my header photos:

“Warning: Illegal string offset ‘width’ in /home2/thewaob2/public_html/wp-content/themes/kerinci-lite/inc/format/content.php on line 13”

“Warning: Illegal string offset ‘height’ in /home2/thewaob2/public_html/wp-content/themes/kerinci-lite/inc/format/content.php on line 14”

These messages are only on my main page/feed, not once you click on the actual post. Does anyone know how to get rid of it? My theme is kerinci lite.

here is my site: https://www.thewanderingflaneur.com

Thank you so much for any help!