It *is* listed in that category, it's just that the public-side page hasn't been regenerated since it was listed. Your site was listed on 13th March, and if you look at the bottom of the category page, you can see that the public-side page was last updated on 4th March.
I've just gone in there and given the category a kick to get it updated. At the moment, page regeneration is on hold while some internal processes are completed, so regeneration requests are being queued. The process should start up again in a day or so.
Please come back here and prompt us if your site doesn't appear after 3 days.