So, you've set up your classes but are your members being charged to book into them? There's one main reason why this would happen.
Did you input a price beside 'All Members'? If you did, the member will be charged this price on top of the membership fee they have already paid. You must only input a price for members if you would like to charge an additional fee for the class.
If you do not want members to be charged an additional price on top of the membership fee they have already paid, select 'No Charge'. Under this option, no fee will be charged to the member's account.
If the member is on a service credits based package, one credit will be deducted automatically when they book the class.
Your class price settings should look something like this:
*N.B All Members = No Charge or if they have a service credits based package, 1 Credit will automatically be deducted when they book the class.