The other Riddles have levels that you get them at, but Riddle of Wind which is supposedly gotten at 66 is lacking the "Lv. 66" designation, grouped with the non-equippables.
The other Riddles have levels that you get them at, but Riddle of Wind which is supposedly gotten at 66 is lacking the "Lv. 66" designation, grouped with the non-equippables.
That's normal, any action that cannot be placed directly because it replaces an already existing button has no "Lv. ??" designation. Since Riddle Of Wind replaces Shoulder Tackle / Wind Tackle after execution, it falls in this category.
It is the same for The Forbidden Chackra, AST's arcana, MCH's heated WS, RDM's enchanted WS, etc.
Edit: It seems now they all have their appropriate level displayed.