Hello Mr. Moyle!
I think I may have found a bug in the Sermon Series List… When I edit a Sermon Series, it seems to remove the old Series Image regardless of whether or not I upload a new Image.
This bug is easy to get around–all I needed to do is always re-upload an Image whenever I edit a Sermon Series–and I rarely need to edit any Series at all, but I just thought that it would be helpful for you to know 
Also, here is a recording of the issue: https://imgur.com/a/mo23Oxf
Have a great day!
(Nathan Verrips for Roy Verrips)