Ok, so reviving this question because this has again become an issue. This time it's happening on a core Joomla Contact item. However, the Contact item is nested in the HTML ID "sp-component," so I'm tending towards this being a Page Builder issue.
NOTE: The edit button shows as available and usable when LOGGED-OUT from the front-end site, using an incognito window in a browser with a completely unused session.
AND: Front-end editing is DISABLED in Page Builder's global settngs.
Even hiding the button from view with CSS, the link to edit the form still shows in the rendered HTML code, of course, so any random public visitor or bot snooping the code could actually edit the form.
Please check this out for us. The link to the affected page and rendered code are is in the hidden content.
P.S. The related original issue with this from 11 months ago never got resolved for us, where the front-end editing button shows on Page Builder pages. I can still present that same issue as well in case there's motivation from JoomShaper to look again.