In the problematic page, you inserted the ShortCode "[cred-form-message]".
This is to be used when the following is true:
Forms can redirect to the edited post, or to a specific page after they are submitted.
The ShortCode [cred-form-message] can be added to the redirect target to display the success message from the form that just redirected there.
This means you need a form to redirect somewhere, to have a Success Message, and then you can place that ShortCode on that target.
On that page, there are additionally 3 Toolset Forms and a few Views (after removing all the non-Toolset content and ShortCodes)
At this point the issue was still visible, but I started seeing several errors due to a cache plugin as this example on top of it:
( ! ) Warning: fsockopen(): php_network_getaddresses: getaddrinfo failed: nodename nor servname provided, or not known in /plugins/sg-cachepress/class-sg-cachepress-supercacher.php on line 104
I disabled all plugins and the Theme, and the issue was gone.
I re-enabled the Child Theme of Beaver, which did not provoke the problem
I then activated a few plugins, and it came back.
Please always deploy the websites you have issues with to a testing server, where you can deactivate the plugins one by one, and change the theme.
Then, the conflicting plugin can be pinpointed by reactivating them one by one or in groups.
This then allows you to provide us with this information and we can solve it.
The problem Plugin, in this case, is Beaver Builder Plugin (Pro Version)
I have only confirmed this on your copy of the site, not on a clean install, and I was as well able to resolve this issue by removing other parts of the page without disabling that plugin.
Those parts are the views, that load a massive list of what seems forms, however, the content of the builder, if disabled, gets so messed up that it's not possible to tell what exactly was setup how.
I will escalate this for further analysis (by myself) where I'll try to find the precise steps to replicate this if you have any hints, they are welcome so I can prepare a report fo the developers.
As soon I am able to do that, they can fix the problem.
It seems due to this form BTW:
[cred_user_form form="edit-user-account-details"]
I was not yet able to see why - but I see it redirects to the same page, where we also expect a success message displayed, so that may be the conflict here.