Thank you, and I wish a Happy New Year to you as well!
I do see a change now on the wesbite:
Both links look precisely the same, see hidden link and hidden link, there is no more full-width layout but much of the form is missing.
That could be due to HTML within the form itself (maybe a missing closing tag) or CSS within the form, as well.
You have some "display:none" rules in there which I am not sure if they affect exactly the parts we are missing (I did not dissect the entire HTML of the form yet)
But I rather suspect it's the et_pb_module et_pb_text et_pb_text_0 et_pb_text_align_left et_pb_bg_layout_light DIV, as seen in the Google Chrome inspect tool, which hides the form behind it.
I demonstrate this on the Screenshot attached.
The nested et_pb_text_inner, which holds the form, does have the correct height and the entire form in it, but it's hidden behind et_pb_module et_pb_text et_pb_text_0 et_pb_text_align_left et_pb_bg_layout_light
There's a max-height: 300px applied to .et-db #et-boc .et-l .et_pb_text_0, so that is why it hides the form behind itself.
There is another max-height: 250px; applied to et_pb_section et_pb_section_0 et_section_regular DIV.
These 2 hide the form.
These styles all come directly from hidden link
Hence, that explains why I did not see this anymore locally after dissecting and rebuilding the site, as the cache or minified CSS wasn't used.
I suggest testing these forms (without Bootstrap as the DOC suggests) and making sure the styles abovementioned are not applying.
These styles seem generated by the Divi Theme, minimized and then cached - which then seems to A) conflict with the Form itself as not displayed and B) most likely, avoid changes made to the CSS to have immediate effect and likely only after saving (as cache would/should be flushed).
Does your Divi website use a cache and minimization of styles?
I would suggest starting with disabling that, in order to confirm, the issue is then solved as the inspection shows above.
Please let me know if not.