Occurrence of data outliers between sensor numerical tests depending on frequency

Hello, I purchased the RAK3172 kr920, and an outlier occurred between the sensor numerical tests according to the frequency for CE certification. I am curious about how to resolve it.

Outliers occurred around 45MHz, 95MHz, and 1000MHz.

The sensor frequency was set as follows.
AT+P2P=919000000:12:125:3:85:22

Additinallly I have attached documents regarding outliers that occurred in the test. Please check them.

Can I get additional PCB antenna ROHS document for RAK3172? Please confirm.

thank you