SCT-013-020 and Arduino R4 Wifi

Hello.  I'm using an Arduino R4 Wifi with your SCT013-020 and ac module that came with it and ran the sample code.  The AMPs displayed are a bit off.   If I connect it up to an Arduino Uno, it works fine (the readings are close enough to the professional ammeter I have). 

The sample code I am running is from: https://wiki.dfrobot.com/Gravity_Analog_AC_Current_Sensor__SKU_SEN0211_

I was wondering if I need to tweak the code a bit?  And if so, do you have any suggestions.   I'm getting lower Amperage readings.  For example a reading of 7.0 Amps comes in around 5.8 to 5.9 amps.  The arduino Uno get's closer - like 6.4 to 6.9.

Thanks for your help.