Perimeter wire sensor help

[miricle]

hi im a Y12 student building an automatic lawnmower for my final project. Im following robert malmstroms build guide.

this build

However im currently having a problem with the detection of the perimeter wire. My perimeter wire station works, pulsing a simple on-off ranging 0-12volts, however the detection sensor is not.

in the link, the build steps page step 19, shows the expected result(sorry i dont know how to attach images) the yellow line represents the perimeter station, the blue is the sensor.

my current sensor detects a weak pattern only a few hundred millivolts, compared to the 4volts of robs sensor. in the google drive is a video of my results as i move the sensor closer and further from the wire.
google drive

in the google drive is schematics and other photos.

on the website is the code im using.

is the current issue a sign of damage that needs a part replacement or poor wiring. Any help and suggestions would be appreciated. feel free to upload your own documents to the google drive.

[gstemarie]

Possible Issues

Component Tolerance: Your components might have different tolerances or might be functioning below their expected performance. This could be capacitors, resistors, or even the sensor itself.
Soldering or Wiring Issues: A poor soldering job or loose wires can lead to increased resistance, affecting the signal.
Ground Loops or Noise: Electrical noise or ground loops can affect signal integrity. Make sure all components are properly grounded and that you're not picking up noise from other sources.
Power Supply: Ensure your power supply to the sensor and the perimeter wire station is consistent and within the expected range.