RM500Q SINR value problem in 5G NSA mode

I got wierd SINR value in 5G NSA mode like folllowing example. Actually, I got from -45 to 355 SINR value among measurements, and those values are all multiples of 5.

+QENG: “servingcell”,“NOCONN”
+QENG: “LTE”,“FDD”,440,10,28D2E50,294,1850,3,5,5,1200,-71,-6,-45,19,0,-,-
+QENG: “NR5G-NSA”,440,10,545,-97,265,-11,703392,79,12,1

However, according to the manual, the SINR value should be in the range -20 to 30 dB. Could you help me in resolving this issue?

Firmware of the device: RM500QAEAAR13A02M4G

Dear @nha
Could you check the firmware via AT+QGMR?

Result of AT+QGMR is

RM500QAEAAR13A02M4G_01.001.01.001