Yes, this has been going on for years.
I usually just fix the links in people's posts when
I see it.
It seems to happen in Firefox the most.
Its a function of the WYSIWYG editor that
messes things up.
It can be avoided by using the "insert link" button
and putting the URL into the field.
It also seems to work better if the user adds
a couple of blank lines at the end of the message,
then goes back up and pastes the link in.
Maybe someday I'll get around to using the newest
version of this WYSIWYG editor...I doubt it has these
same issues.