The caching program is WP-Rocket and it uses Imagify.io
Maybe I turn it off? see email
Craig
WebP compatibility
NEED HELP?
Enable this option if you would like WP Rocket to serve WebP images to compatible browsers. Please note that WP Rocket cannot create WebP images for you. To create WebP images we recommend Imagify. More info
You are using Imagify to serve WebP images so you do not need to enable this option. If you prefer to have WP Rocket serve WebP for you instead, please disable them from serving in Imagify. More info