Discrepancy on the 'Form and button conversions' analytics page

Site URL: https://rebeccalennoxstewart.com/infernal-regions

There is a discrepancy on the 'Form and button conversions' analytics page on my site.

I want people to sign up via my Squarespace landing page - this is linked to my Mailchimp database. The figures on the top graph (about 22 new sign ups) are correct with what is in Mailchimp. However, the bottom analytic says there are 46 submissions and 50 unique views (see screenshot). I can't figure out where the extra 24 sign ups have gone. I did once have a Squarespace mailing list accidentally linked to a form, but I've checked and it's not this.

The FB ad I've uploaded says that about 200+ people have clicked on this link (obvs my landing page is not converting, lol)

Is there something about the terminology I don't understand - or am I missing 46 new sign ups, or are they bouncing?

Any hints or tips about this gratefully received. I just need to know if I need to troubleshoot this at the Squarespace or the Mailchimp end. Many thanks, Rebecca S

I just had a good bike ride and am wondering - could I be giving people too many steps to fill in their email?

Could they be clicking on the red sign up button (which is recorded on Squarespace analytics) - then when they get to the actual email input they're changing their minds about it?

I'm going to have a tinker.

If anyone knows how to get the email sign up on the actual landing page like the image attached - instead of adding another step and page to the process, please let me know. Everything I've tried in the landing page editor (my template is 'Flash') only gives the option of a single button and requirement to step through to a new page.