My apologies for the late reply, but I do not work on Wednesdays and Thursdays.
Would you allow me temporary access to your website to check this further? Your next reply will be private to let you share credentials safely. ** Make a database backup before sharing credentials. **
Hello Eric, I am not sure to find where do you try to add the thumbnails. The following content template does not seem to be picked for fighters: hidden link
Are you adding it inside the Divi builder? Can you share a direct URL where I can see it?
This being said, the supported integration with Divi, right now, is through the Toolset Views module.
Currently, you are adding the images to the Divi template using an intermediate Toolset content template "Fighter Photos(#2643 )". I was able to add a Toolset gallery inside of it, which produced the following results hidden link
However, it is not using the thumbnails of the images. It is actually using full-size images.
This gallery is a Toolset gallery block with a dynamic source to the "Fighters photos" custom field.
Currently, the gallery block does not use thumbnails. I believe that we'll support thumbnails in an upcoming release. Let me know if this is a viable solution for you. Or if you need to generate thumbnails instead of full-size images.