After I checked if something happened with the cables, if everything was plugged in the right doors, etc. I think that it has to be something the nrf24l01. The output of the software that I used to test is still the same. I have no idea of what happened. Did the chip burn for some reason? Could it be something with the arduinos (I am feeding the modules directly from 3.3 volts of the arduino)? Is it going to solve the problem if I replace the nrf24l01? I am completely lost and have no idea what is happening. 