recaptcha is not shown, after validation error

[hauszerm]

Hello, I have integrated the reCaptcha into an ASP.NET MVC form for registering new users. When the web form ist opened for the first time, the reCaphta is shown and if the form is filled with correct parameters, the registration can be finished successfully. If a user set in some wrong parameters in the form, the server side validation detects an error and the registration form is shown once more, but without the reCaptcha. How can I force the reCaptcha to be schown again after a validation error?
Now the reCaptcha is only be shown once more, if a user hits the browser reload button or F5.

[Ori4]

I am experiencing similar reCAPTCHA behavior on my site's Contact page.
Any idea when/if this issue can be fixed?
Much appreciated.