version 3.2 Patch 5. Build no. 3.2.4856.19326I am not sure but the latest official patch for 3.2 is Patch 4 (3.2.4813.16821). Yours is later somehow.
In all cases, 3.2 is currently outdated by 4.0
The Extranet version is 1.6.5.The latest version of the package is 1.7.2
I would recommend you back up your website and upgrade the Extranet package (uninstall and install the 1.7.2 version) and see if the problem is gone.
BTW, I couldn't reproduce the issue on a 4.0 with Extranet 1.7.2