Hi,
The issue was even before the MOSFET's were connected. I was just testing out a condition to operate my pneumatic piston with the feedback from the sensor as a reference value and a pushbutton to give an input.
I checked with a multimeter as u said and the voltage reading between the 5V and GND on the arduino board reads 5.02V. The strange part is that the cable I am using to connect my sensor ground to the arduino GND is exactly the same and it didn't burn out. Only the ones connected on the breadboard are burning out. I know this is completely strange as I didn't find any such issue online. Do you guys think there was some overcurrent for somereason which caused this issue and this was a one off situation or will it persist and maynot appear all the time but when it does it will burn out my wires.