Form page lost CSS formatting

Hi

Many thanks for Visual Form Builder – it’s great – but unfortunately, I’ve recently encountered a problem.

A few days ago, the page containing my main form lost all its CSS formatting. You can see it here: https://www.inglesnaturalmente.com/informacion-clases-ingles/

No changes had been made and the plugin is up-to-date. Any idea why this might be happening?

Thanks
Gareth

https://www.ads-software.com/plugins/visual-form-builder/