I asked why during the Paypal…
I asked why during the Paypal validation payment it was added 27.78 € of shipping cost for a group purchase of 4 items which was all with free shipping for France. The answer was that it was because I chose a paid sending mode, but I could not select the free shipping on the PayPal payment confirmation page. This did not answer my question and ended up ordering the items separately to benefit from the free mailing.