Could it be that this script somehow gives an extra login prompt (fake) and that your users are actually entering their info in there?
Save all your files and database.
Disable and remove (all files!!) all modifications
Disable all your styles and create a new style with no parent (= default style) and set this to be the only style to be used on your board.
Check for modified files using AdminCP -> Maintenance -> Suspect file
Contact vBulletin support for assistence.
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