Hello Josh,
Thank you for reaching out and I am happy to assist you with this.
I’ve checked the images and indeed, they are converted by W3 Total Cache, for example https://przdb.wpdevsite.co/wp-content/uploads/2022/08/202208_ProteaVillage_105.webp
If you find that your original image has been converted to WebP, but other image sizes are missing WebP versions, you may need to double-check that your WordPress environment supports the WebP format.
While the original image is converted via our API service, the different sizes (e.g. Large, Medium, Thumbnail) are created by your own server. For this, you must have WordPress 5.8 and the appropriate libGD or ImageMagick package available on your server.
To check if your WordPress environment supports WebP, navigate to Site Health > Info > Media Handling and double-check that WebP is listed in the supported file formats for the library shown in the Active editor. If you find these are missing the WebP extension, consult your system administrator to set up the correct packages.
Thanks!