Joe Rossignol, MacRumors:

Apple One includes a 30-day free trial for any services that customers did not already subscribe to individually, and that trial period ends today for those who signed up for Apple One on its first day of availability. Following the end of the trial period, however, some customers are seeing their Apple One subscription listed as expired and/or have been billed individually for services like Apple TV+ and Apple Music that should be rolled into Apple One.

All in all, there are clearly some hiccups going on as Apple One converts from a trial to a standard subscription, so hopefully Apple is able to sort out the issues soon.

My billing is all over the place. I signed up for the Apple One Premier bundle and I am still being charged for all the extras that the bundle is supposed to replace.

My sense is that Apple is going to make all this right over time, without my having to jump through any hoops. So if this is you, have patience, but keep an eye on your subscriptions page, make sure Apple has ultimately balanced your account properly.