same podcast, two listings in podcast section

Hi,

I started downloading a podcast on my iMac, for a couple of months while out of the country I downloaded the same podcast on my iPad. On my return I transferred the podcasts from my iPad to my iMac for a complete version (central hub). For whatever reason I now have two listings for the same podcast on my iMac. Both have the same title/logo/art but are listed seperately. I tried to pull one into the other but iTunes would not allow that.

How can I add one set to the other so not to have two listings of the same podcast?

Thanks,

Philly