I'm on a Mac but I find this same behavior happens sporadically with me. I need to re-copy my original text and run it through paste special a second time. Or I will convert my rich text to plain text in my clipping program before bringing it into FreeHand. If any one else has an answer to this, I'd like to know as well. Like I said, it only happens every so often.
There was a similar issue on the Mac sometime in my hazy past.
The solution at that time was to clear the system clipboard by going to the Finder and copying any unformatted text – a filename will do.
Then copy the text you want to bring into FreeHand.
I have no idea if this will work for you on a Windows machine. Good luck.