That may be because the font isn't embedded in the web page
software, which is always a problem with unusual fonts. I may be totally wrong here, but if you paste it into a real text editor (not a word processor, but something like Notepad) and you can see the symbol as it is supposed to be, I am thinking that when you cut it, it is now in ASCII format and can be copy and pasted into a web document. Maybe I have just been lucky when I have done this. Over the years, I have always got around the limitations of Word and other word processors with their wacky code that often does not paste properly by using a text editor as an intermediate step. Word documents will not usually even paste into another word processor without issues. Things are much better now, but cutting and pasting out of Word has always been an issue. This is one reason that the PDF format was invented (for viewing). I actually do most of my
writing in a text editor and then paste into a word processor if I need it formatted more than the text editor can do. Otherwise, I just leave it in text files.
Regards,
Virgil