Thanks for the photos and screenshots @SalvaMoore, it certainly helps.
This is a wireless sensor, correct? Please refer to our support article for the Hunter Rain-Clik.
It looks to me like the white wire from your original wiring needs to go into the SC, and the small blue wire will go into the SP.
If rewiring does not show any improvement, then could you please check the sensor to see if it is dirty, damaged, has a dying battery, or other defects to see if the issue might be with the sensor itself?
I located this Hunter MiniClik User Guide with sections for Maintenance & Troubleshooting:
If you still experience no improvement, I might also suggest attempting to switch the wiring from the S1 terminal with the S2 terminal in order to further rule out the controller.