OmegaHat and install packages menu

On Windows, if I set the repositories to only Omegahat using
the

   Packages | Select repositories

menu and then bring up the install packages menu:

   Packages | Install packages

I find that several packages are listed twice.  Why is that?

I am using Windows XP:

"R version 2.4.0 Patched (2006-10-07 r39598)"