Invalid command line argument when deploying custom msi

I am trying to deploy PDFill as a custom package. It successfully uninstalls the previous versions as described in the pre-deployment activity, however it will not install the new version. The custom package only has "/quiet" as an MSI property, but the log file shows different. Where are the extra arguments like ACTION=INSTALL coming from? Here is a snippet:

[ 2014-12-10 09:13:39:026 ] [ 3880 ] [INFO] ########################################## INSTALLATION ###################################################
[ 2014-12-10 09:13:39:026 ] [ 3880 ] [INFO] InstallGivenPackage : Going to perform the Installation action for the given Package.
[ 2014-12-10 09:13:39:026 ] [ 3880 ] [INFO] Startup Type for the service : m is 3
[ 2014-12-10 09:13:39:026 ] [ 3880 ] [INFO] InstallMSIFile : Set the Current Diectory called with \\midpatch\DCSWRepository..!
[ 2014-12-10 09:13:39:026 ] [ 3880 ] [INFO] InstallMSIFile : Install File Path : \\midpatch\DCSWRepository\PDFill_X64.msi.
[ 2014-12-10 09:13:39:026 ] [ 3880 ] [INFO] InstallMSIFile : Command Line Params : ACTION=INSTALL /quiet REBOOT=ReallySuppress ALLUSERS=1.
[ 2014-12-10 09:13:39:026 ] [ 3880 ] [INFO] Message : The operation completed successfully.
[ 2014-12-10 09:13:39:416 ] [ 3880 ] [INFO] deleteValue: Key found ...!: 0
[ 2014-12-10 09:13:39:416 ] [ 3880 ] [INFO] deleteValue: Delete value DCCreateProcessStatus success!
[ 2014-12-10 09:13:39:416 ] [ 3880 ] [ERROR] Error Code : 1639 , Error Message : Invalid command line argument. Consult the Windows Installer SDK for detailed command line help.
[ 2014-12-10 09:13:39:416 ] [ 3880 ] [ERROR] InstallGivenPackage : Error while performing Installation function.
[ 2014-12-10 09:13:39:416 ] [ 3880 ] [INFO] *************************************************************************************************************