Email Follow Box Layout issue

HI,

I have installed your plugin for only the email Subscription form to get email subscribers. I have changed my colour pattern and font style and it is showing perfectly in the demo/preview. Once I have added the code to my website,  the layout of the form box shows in different designs/styles and not in an optimized way. Showing an ugly look.

 I have tried to add the code generated from the plugin in the widget area and manually add it via HTML. No luck, sometimes it is working well on the desktop. In mobile, it is not loading properly, sometimes only showing in grey colour only with email box and button.

Also, I have tried to add the code without plugins and added it manually. still, the issue persists.

I m using WP-rocket for my WordPress, Is there any relation to this?

Attached the screenshot https://paste.pics/HXS8R