When I copy text from a web page, I notice a lot of "overhead" comes
along with the data: fonts, some formatting, etc. I can only guess
this may be causing the problem. As a test, the next time you copy
some data, paste it into Notepad first: all overhead will be stripped
out, and only the text will remain. Then copy from Notepad into the
clipboard, and paste into Excel from there. I hope this works out for
you!