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LM3530: OVP pin has 0 V

Part Number: LM3530


I used the LM3530 for my display LED driver. I produced 8 pieces and 2 of them working fine. In other 6 PCB, I have the same voltage from SW pin to OVP. On normal PCB, the OVP pin voltage is 40V. But here I measure the same voltage as SW pin. Is there any possibility for OVP pin to have 0 Volts? Or it is just these PCBs are damaged or the OVP pin doesn't have good contact to the PCB.