It is recommended that you create a specific Contact Form for your widget and that you do not display a contact form that is also displayed within a page on your site . . .
An overview of how to configure the various settings and options for the Dynamic Contact Forms add-on . . .
The use of web caching plugins is extremely common these days as they can help improve the speed of delivery for static web pages as well as improve page rankings upon popular search engines.
However, in circumstances where dynamic content is being displayed on a page, web caching can cause problems.