Have a look into the -059 schematics (Program files(x86)\Cypress\CY8CKIT-059\...)
Both of your pins are bypassed with a 1µF capacitor for analog /Capsense use.
When using other pins, do not forget to provide the required pullup resistors.
You are right, thank you !
I will try with pin 0 and 0 and I will move my pullup resistors.
Problem solved !