Please have a look at

http://git.mantisbt.org/?p=mantisbt-web.git;a=blob;f=config_defaults_inc.php;h=f457cf6991a6f89618ddfdb7b69b39fc05a93d01;hb=HEAD

contains
# The latest version from the stable branch.
$g_latest_version_stable = '1.1.8';

# The latest version from the development branch.
$g_latest_version_dev = '1.2.0rc1';

But website shows:
The latest stable version is 1.2.0.
The latest development version is 1.2.0rc2.

Is there an unclear workflow how to update the webpage?

Regards
Roland