Prestashop show only one carrier!

[lennaz]

Im using Prestashop 1.6.1.8

 

i configured 3 shipping method;

- Pick up in store, it is free and enabled

- Fast Carrier, flat rate 10 euros

- Slow Carrer flat rate 5 euros

 

the problem is at checkout, the user is prompted only with the cheaper one! no way to change carrier or choose;

it always show "pick up in store", if i disable it, it shows the slow carrier, if i disable it too, it shows the fast carrier

 

 

it is a CLEAN out-of-the-box installation

carriers are configured for the righe zone (in fact they show to the user even one at time) and configured for all level of users

 

am i missing something? i have installed and used lot of PS with no problem, but since a couple of version i have this behaviour

 

thank you