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Just checked and "Top:World:Japanese" has 50,424 sites listed in www.dmoz.org [dmoz.org] and only 1 in ch.dmoz.org [ch.dmoz.org].
That is still much better than the French pages which dropped from 78,447 to 67 in "www.dmoz.org" (although it looks the pages are still there and it is only the index that is incorrect).
A Japanese site in Japanese submitted anywhere else will probably be deleted because the editor may not have the character sets installed or if they do, may have no idea what language it is in or the appropriate region to send it to.
If you are lucky it might get transferred to an appropriate World/ category.
By "submitted to some Japanese category" did you mean "submitted to a category ABOUT Japan" (i.e. somewhere in Regional/Asia/Japan) or "submitted to a Japanese-LANGUAGE category" (i.e. somewhere in World/Japanese)?
The former is ONLY appropriate for ENGLISH-language sites (regardless of what the client says!) The latter is ONLY appropriate for JAPANESE-language sites (again, if the client says different they're just wasting their breath and your time. If they have trouble with the concept "the client is not always right", I suspect the story of King Canute would translate well into Japanese.)
Multi-language sites may be listed under every relevant language.
Ummm, no this should not be happening. If it is submitted in the wrong place, and not already flagged as being listed someplace, then the correct editor response is to try to find the correct place for it to go. The TLD part of the domain is often a clue (like .jp for Japan, and .th for Thailand, etc) to this. If no idea, there is a "Misplaced Sites" category the site can be dumped in, for some more knowledgeable person to tackle. At worst, it is left where submitted for someone with more of an idea to tackle. The incorrect response is to delete it (unless it is obvious toxic spam, or already listed).
That might not be the reason, but it is one obvious one. Also, right now the edits that editors are doing are not showing up on the public side, so you could have been added. You could ask at resource-zone about it.
But it could be any of 100 reasons. Maybe the editor looked at the site but is planning a more indepth review later.
You could always email the editor directly or simple inquire as to the status of your site at the resouce-zone.
Be aware that editors are advised to not respond to email from submitters, to avoid their mailbox filling with spam if communication turns nasty. In any case when you say email "the" editor, which editor do you actually mean? There is no way you can tell whether the listed category editor, some higher category editor tending the lower ground, or a direcory wide (Editall or Meta) editor actually looked at your site. The editor that you email might not actually be active.
An enquiry at Resource Zone is a far better option, then one of the many people who can access that category can let you have an answer. Use the Site Submission Status forum, but please first read the things in the Forum Posting Guidleines and ensure that you follow them.
Also, right now the edits that editors are doing are not showing up on the public side, so you could have been added.
See also Did dmoz go backwards? [webmasterworld.com] msg 10:
The public side is a week old, and is "frozen". No changes are appearing there, and will not do so for another week or so. Meanwhile editors are still editing, and the edit side shows all the latest changes. This is a planned part of the upgrades and system changes.
This could have been a second or third visit as well. The editor could have copied and pasted the URL to a new window the first time around. They may not have had a chance to complete the addition and needed a quick once over for a number of reasons.
I do this commonly as an ODP editor. In fact, the site owner from their logs may never know an ODP editor looked at their site. The reason is that I always do editing at the ODP using IE as my browser. Typically if a site has serious browser compatability issues it'll be that it works in IE only. Thus, I'll cut and paste the URL into an open window of Mozilla or Opera to review the site.
I know the editor who approved it, she edits very far and wide and gives an enormous amount of time and effort. She approved/moved about 15 sites into the cat in question on the same day, all with virtually the same descriptions "contains company profile, contact details, and product catalog". Strong scent of greenbusting or something like it. And the cat in question is in a very neglected corner, no one seems to put any effort or care into it, hurried, dutiful approves and deletes is about it.