No fine print, no secret not hidden, it's what you ticked as to having 'read and understood' in order to be able to list

Not sure when you were ever able to sell for 2.5%  or how you managed to only pay 12.18%  this time

The fees were shown when you listed

If you have been using eBay for a reasonable long time, it is surprising you did not notice what the real fees are well before now, since they have been roughly the same for eons 

Sellers with a poor record due to defects etc will pay even higher fees

If you sold on this ID and have failed to complete sign up and verification for Managed Payments, that might also have something to do with it

As well as meaning you won't get the money from the sale, since it has nowhere to go