My form only show once

Suddenly, one of my forms only displays on the website once and is absent upon refresh or next visit.

It's there on a different computer - but absent after it's been submitted.

What have I changed to cause this?

The (Simplified Quite form) is embedded on a website here:

https://www.darglow.co.uk/Get-a-quote-overview/Get-a-Quote-simple/

I checked your page and it looks like the issue is being caused due to loading the https page and embedding the form without using https:

Update your embed code from:

<script type="text/javascript" src="http://form.jotformeu.com/jsform/30804544997363"></script>

to:

<script type="text/javascript" src="https://form.jotformeu.com/jsform/30804544997363"></script>

You can also try using your forms current iFrame code if that still does not work:

https://www.jotform.com/help/148-Getting-the-Form-iFrame-Code

Ah! thanks for your input David - I'll revise that and see how it performs.

Thanks again :-)