No.
How are you measuring those voltages? What are you using to measure those voltages? What is the power supply to the Nano? How is the supply connected to the Nano?
Post a schematic. Show on the schematic the points of measurement.
No.
How are you measuring those voltages? What are you using to measure those voltages? What is the power supply to the Nano? How is the supply connected to the Nano?
Post a schematic. Show on the schematic the points of measurement.