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Okay, then your specific site layout might need different CSS to make it work. Unfortunately, that will require asking ConvertKit support to look at your site and give you custom CSS suggestions!
(Formatting hiccups like this is one of the things I don’t love about using ConvertKit forms.)
If you still can’t get it to work properly, then your best option is probably to use an external form-building tool. (Like ConvertBox, OptIn Monster, etc.)
OR, you could create a banner on your site (using a plugin like https://wordpress.org/plugins/wpfront-notification-bar/, or perhaps your theme can add banners natively) that just links to a ConvertKit landing page.
OR you could decide not to use any type of banner or pop-up on mobile and just use embedded forms (but opt-in rates will probably be lower.)