Jerry Stuckle wrote in news:ltn6p0$fbt$2@dont-
email.me:

Your message shows up just fine in both newsgroups.


Gets posted to both. Some clients, like Xnews, will have a setting to show
it only once, the first time it is read regardless of which group that is.
This, and the subject change, are both likely candidates to explain the
behaviour seen. There may be more.