Val,
I pretty much have no idea - shot in the dark sort of thing. Have never heard of this happening on a list before.

Maybe you could check if there is any chance you are signed up twice in the group? Do you by any chance have two email addresses or something like that? I'm not a moderator on that group or I would check.

Also, you could consider sending an email to one of the group moderators and see if they can tell anything.

Sometimes my ISP/email provider gets a little out of synch and sends messages twice and then it clears up, but it doesn't seem like that would be the case here if it only ever happens with this list.

If you still can't figure it out then the only other thing I can think of is to write Yahoo - got to help on the Yahoo page, click a help topic, and then say no it didn't help you and then it lets you write to them.

Kitty