Fundraising - Auto re-direct from Paypal goes to 404 page.

I am trying to set up the Fundraising plugin on my site and I'm having a couple problems. It seems that the url that you go to after making a donation is missing a / in the address. ex. It's going here:
Instead of here:
Please advise, I'm guessing it's something I can fix in the php or something where it's just missing the / I just don't know where to look.