I really think that's a software issue because I tried a hard reset by flashing the original 4.4.2 stock rom image. it worked once and it stopped again. Then, I tried flashing stock again but it didn't work. Also, the charger seems to recognize that there is a device with wireless charging capacities but it turns off after 2 seconds.
Is there an activity or something that makes the system recognize the charger and start in fact charging? I searched a little bit but I can't find someone with the same issue