Yeah it seems like your button 1 on bar 3 isn't working. Does it work if you push it manually?
Personally I use the following macro for my mount macro:
/use Swift Flight Form
/use Blue Wing Rider
/use Aquatic Form
/use Abyssal Seahorse
That way it will use Flight form unless its in the water, in which it will use the Blue Wing Rider in the water, unless underwater like in Vash it will use Aquatic Form, and for whatever reason if that doesn't work it will finally use the Seahorse. Saves me from having to swap macros and such.