Occasionally we do get feedback that the shoes are squeaky. This is not actually a manufacturing fault, but a pocket of air which is trapped between the insole and the outsole.
Tip: Try taking the insole out, sprinkle talcum/baby powder on the base and leave overnight to settle, then next day shake out the excess talc.
If your shoes don’t have removable insoles, sprinkle the powder along the seams of the insoles instead of underneath them. The powder will help reduce the friction between your insoles and shoes so they don't squeak as much.