Hey Agatha,
The “Night Zoo” tag was hidden from the list in the “Photography” section because I’ve hidden some of the items using CSS previously (following your requests). I’ve made changes so that the tag in question is visible again.
I must note that your instance of the Sensei theme has been so heavily edited that I would recommend consulting with a WordPress specialist for any changes in the website’s structure (incl. new tags etc).
Sincerely,
Andrew / Satori Studio