» Tue Mar 15, 2011 2:35 am
I believe that some mods use such a penalty when they want to prevent the player from moving, e.g. for some special camera tricks or to prevent backwards movement or something. You'll need to post your load order to get more specific/useful insight.
If the penalty doesn't show up in the Active Effects list then it's probably been added by a script, and if it hasn't gone away then the script has probably glitched and forgotten to reverse it. In that case you will need to fix it yourself, either using the 'SetAVMod' console command or with one of the http://www.gamesas.com/index.php?/topic/1139904-relz-stat-cleaner/page__hl__%22stat+cleaner%22 mods.