Google reCaptcha - Selected Image keep getting replaced with new Image
<p>When we select a captcha image, it fading away and a fresh new image is getting replaced, as shown in below screenshot. Same for all images in that captcha. For over a year we had no problem, but only since 2 days we are seeing this(no change is done in the page). </p>

<p>Additionally, this problem occurs intermittently irrespective of browsers, OS, or Browser Incognito mode. 
We tried changing security level at Google Developer Console to low, medium and full but of no use. If you have any clue or handled this before, please let me  know.</p>

<p>Note: I see this problem for my work website, personal website, as well on <a href="https://www.quora.com/?unh=1ef8a4b746f6122be5f2bce4c18ac6ab&amp;uid=6198324&amp;time=1466418132119030#" rel="noreferrer">Quora Signup</a> page also!(may have to keep refreshing for a while to see the problem). </p>

<p><a href="https://i.stack.imgur.com/nd8FZ.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/nd8FZ.jpg" alt="Google captcha replaced always"></a></p>