Redirection 2.2.5 Update Issue

I’m doing a comparison of all my WP sites to make sure all are up-to-date. In doing so I’ve noticed something odd with the Redirection plug-in. Two of my sites are both using version 2.2.5 of Redirection, but the underlying code is different.

For example, in the “/models” subdirectory of Redirection, the htaccess.php, and monitor.php files are different. In addition, the “readme.txt” reads differently. One of the readme’s says:
“Tested up to: 3.1.2”

The other says:
“Tested up to: 3.1.1”

If I try to automatically update my WP site plug-in to the latest version, I’m unable to because I receive “You have he latest version”, which I apparently don’t. It seems that I’ll need to do this manually, but thought I’d let the publisher know of this issue.

http://ww.wp.xz.cn/extend/plugins/redirection/