Whenever I defeat a Pokemon, wild or tame, my pokemon only gains 1 exp point. I thought it was due to the line in settings but when I changed it to false, the pokemon doesn't gain any exp and the battle just ends.
I only tested this with an eevee(lvl 5) against a magikarp(5) and an audino(8) as well as an electrode(45) and zweilous(25) against abamasnow(45). As a side note, this was all in debug mode.
Edit: Same problem both in debug and the game.exe.