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Is it possible that the editor has deleted them but the changes won't appear the the public for a couple of weeks?
Unfortunately, the internal dmoz.org search engine is only rebuilding its index about once a week, and at least once or twice recently it has skipped a week due to RDF generation problems, so many new listings will not appear in a search and many old, deprecated listings will.
So it could easily take 2 weeks for the editor to even review your listing, or longer if there's no editor in that cat. If you submit to a cat that has a large backlog, you could theoretically wait forever for someone to look at the listing.