I am seeing a weird difference in how this plugin works in two different environments. Each environment has the same settings under Discussion in the WP dashboard and is running the same version of JetPack, the plugin and WP, and is using the same theme with the same comments template.
On this site the plugin is creating an iframe inside the #commentform div, so the #reply-title is outside it and affected by my CSS rules.
On this site the iframe is inside the #respond div, immediately after a div #cancel-comment-reply-link. The #reply-title is served inside the iframe, and so is not affected by my CSS rules.
Can anyone have any idea why I'm seeing this difference? And can anyone tell me why on both pages the plugin creates an iframe 315 high, creating a big white space below the comment textarea?