My Forms don't send

Hi,

I am a chronoforms 5 user, but recently the forms are no longer working. They don't send their emails anymore.
So I tried anything with email/php servers etc, but no succes. I thought it would help to switch to chronoforms6.

But I have still the same problem, but worse. If I send the form, it will lose its shape and doesnt work anymore. I have to delete the cache in joomla and ctrlF5 the browser. Then is says that the form is send. I get the email. So, basicly it works, but what is holding it back? The debugger says verry little

If I don't cache on my joomla 3.8.3 site, it works fine (it was set on progressive caching)

And when I set it on conservative caching it is the same problem. When you fill in the form and use send, the form is presented again, but without formatting. It won't work at all, but when I delete the cache in the backend of joomla and use on the frontend ctrlF5, I get the thank-you message and the maisl are send