Change password behaviour after implementing new login module

I implemented the CAPTCHA logon module according to the following blog.

http://scn.sap.com/people/erhan.keseli4/blog/2011/11/28/using-recaptcha-at-sap-portal-73-logon-page#comment-353782

and its working fine with only one strange problem. Users login and logout fine without issues but whenever any user is required to change their password, after the change password page, instead of showing the portal home page, user is thrown back to the login page. I can''t see anything in the logs about this behaviour. If I remove my login module, change password works fine.

I am using EP 7.31 SP06.

My login module is assigned to the "ticket" policy config with the following hierarchy.