Thanks for your reply.
To start, here is the Schematic with some test results: Schematic
Let me explain how I'm measuring the current:
I have the Sensor connected between the power source and the ESC (+ / - of the battery and esc). The "inaccuracy" I'm observing is only when I test brushless motors. I tested shut resistor(s) and bulb to check the amount of load and I got accurate readings.
Now, I included a plot with two current readings (accurate and inaccurate).
Accurate Reading : I took (1) voltmeter wire and connected to the sensor and I was able to get accurate readings!
Inaccurate Reading: I replace the voltmeter wire with a 12AWG (same as all my other wires) and I observed inaccurate readings.
Resistance of the Wires:
Voltmeter Wire : 257mOhms
12AWD Wire: 3.5mOms
Any help? I spend two days trying to figure this out and still can't find it.