So, I was testing the Sculk Sensor on the different Redstone outputs created by different interactions and I tested the fishing rod and when you are close to the Sculk sensor it gives to different outputs for casting and retrieving the line which I think is good but then if I do the same from a distance it creates an output which has the same strength as mob noises when I cast the line and when I retrieve the line, it gives no output. Here is a set-up to test it yourself; 

Use a distance when you are and aren't able to activate the Sculk Sensor.