That is a problem with the ToC which the devs need to solve. As far as I know they are aware of it, but didn’t get around to do it so far. @HongDa?
(The title for the six sense fields has originally been forgotten in the ToC, and later been added without full success.)
But make sure that all ToC links point to the right topis—this is your part to fix (see here; you may compare with the German under sn-guide-sujato_translation-de-site in Bilara).