New Recaptcha Doesn't Work Twice In (basically) The Same Page

For my website I'm loading all subpages in a div that basically covers everything but the menu via jquery. The structure is like this, you press the account button, and you get the

Solution 1:

I had this Error too:

Uncaught Error: ReCAPTCHA placeholder element must be empty

in my case the problem was, that I imported the library twince.

More exactly: My CMS MURA imported the library once, to provide reCaptcha as default service. And I imported the library the second time, not kowning.