There is an alignment issue in the CAPTCHA window. 

- Some time the I'm not a robot checkbox went out of the modal window. 

[![enter image description here][1]][1]

- Some time the modal window occupying the full width of the page, it expected to aligned center.  

[![enter image description here][2]][2]

The issue found on Mozilla Firefox 67.0 (64-bit) in Windows 10, with 100% Zoom.

  [1]: https://i.sstatic.net/WvWjZ.jpg
  [2]: https://i.sstatic.net/9qqIQ.jpg