Sometimes I encounter problems which prevent plugins from paying nice together. A client called me with this issue that I am certain he generated due to tinkering. However, I’m glad this happened so that it may be listed for others to avoid.
PROBLEM: Caldera forms not displaying on the contact us page.
SOLUTION: Do not turn on “Disable WordPress Embeds” in the WP Rocket settings under Media > Embeds > “Disable WordPress Embeds” This disabled the Caldera Forms shortcode and you won’t be able to see your form. Leave this setting OFF! Then you may use these two plugins together.
The WordPress Embed feature allows you to wrap embedded items using a simple Shortcode to set of a maximum (but not fixed) width and height. See Embeds here.
Obviously Caldera Forms uses the WordPress Embed feature in the form shortcode