Zoho Form utm tracking for direct visits

Hello,

I've set UTM tracking for a Zoho Form. The form is embedded via iframe on my website.

When navigating directly to the the site and submitting a form, I see the following parameters are tracked:

Where utm_source: is the domain of the website (not of the page where the form is embedded).

My questions are:

why do the "utm_source" = the website domain and not an (undefined) value?
as the visitor (which in this case was me) is coming from a Direct visit, why is the UTM tracking code returning the "referral" value as utm_medium?

Here's the code I used to embed the form on the website:

<iframe frameborder="0" style="height:650px;width:99%;border:none;" src="https://forms.amotive.it/XXXXXXXX/form/DiventaclienteAmotiveITAENG/formperma/XXXXXXXXXXX"></iframe>

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