Hello,
Thank you all for your replies.
I have loaded my software on a nucleo-l073 (STM32L073RZT6 : which is a LQFP 64 CPU) that is an evaluation board from st microelectronic, and on this board, i consume less than 3uA with stop mode activated (CPU is stall and is waken up at regular intervals, only RAM is maintained)
I have decided to make my own board but on this custom board i'm using a STM32L073CZT6, that is a LQFP 48 package (two GPIO ports have been removed). So on this new package, my software should handled the GPIO as they were on the previous package because they were previously present. There shouldn't be new GPIO to be handled.
So, that's why i'm not suspecting a missing GPIO configration but rather a soldering issue or the finition of my PCB but i will take a look at the software to know if i can find something.
Thank you again for all your replies.
Best regards,
Aurélien