I seem to have a later Bikkuriman, because on my copy it's the right side up. My Kung Fu and Shanghai are "upside down" as well.
My Bikkuriman has a little hologramm sticker on the cover of the booklet; did all versions have that? Top of my head I don't remember seeing that on another game.
While on the topic of such "oddities":
I was somewhat baffled to notice the ArcadePRO Card saying "CD-ROMĀ²" on the narrow side of the case, the inlay tab. I understand that it says that because it is for such systems, yet it seems odd to me as it is a HuCard.
I guess it says "Super CD-ROMĀ²" with the ArcadeDUO Card
Kind of illogical then for it to say "HuCard" on the TenのKoe Card, isn't it?