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TPS562200: output is higher than target

Part Number: TPS562200


My customer used TPS562200 to power a led matrix. so far, they produced 300 pcs , but 80%  output  5.35V, only 20% can output target voltag which is 5V. 

Below is the shcmeatic, 12V input, 5Voutput, test without load. please help to suggest potential issue. what may casue this higher voltage output? thanks. 

BTW, some difference highlight:

1. R27,R28 is 1/10 of recommended value

2.C21(1uF) is mounted

3. a few boards can recover by switching L2.