Hi Nereus,
Most probably you have electrolytic or tantalum capacitor connected to Vdd and that is causing some of the leakage current. Also PIC settings can increase current consumption.
Ceramic capacitor have less leakage, but capacitance is more limited.
What is you power supply and voltage?
What equipment do you use for current measurement?
Noisy environment can easily cause inaccuracy in nA range.
BR,
-Gusse-
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