Hi,
KDS is the manufacturer name. The type is still missing.
I read some of the KDS datasheets. They don't tell much.
Often they speak of a serial capacitance of 8, 10, 12 pF. Because you probably use two capacitors to GND - from electrical view - they are connected in series. Therefore you need to use capacitors with twice the given value. So 16, 20 24pF is good.
But this is the total capacitance value, you need to subtract the PIC's input/output capacitance.
--> your 22pF are on the upper limit, but the value should be OK. As long as the PCB layout is good and there are no other devices involved.
Good layout here means: short traces to crystal and capacitors, low impedance ground plane from capacitors to GND connection of PIC. Also a capacitor with short wires from VCC to GND of PIC is essential.
*****
What else can make the circuit to fail?
* ultrasonic cleaning ( more problematic for the crystal)
* capacitors mounted near the edge of the PCB, combined with thermal or mechanical stress
* too thick solder stop film underneath the SMD capacitors, may cause the capacitor to *****.
* flux residuals causing corrosion and leakage currents
* wrong capacitor type
* additional resistors or additional load
..
Klaus