You bought a GoWild pass that stated you can only book one calendar day before departure (domestic) or longer if int'l.

Now, Frontier as a surprise announced bookings could be made further in advance on "many seats, many flights excluding FRI/SUN."

The June examples you posted don't offer Go Wild, seemingly because the overnight connecting flights happen to fall on a Friday. Perfectly reasonable in my view.

You should be able to book any of these days/flights with 1 day notice, as long as they are not overselling. If Frontier does a good job selling to capacity, passholders will need to find other dates.