Today this Weird bug appeared and I lost all my units!

I had 5149 units in game which I had collected by grinding arena and opening battechip crystals. It took me so much time and then today this weird bug appeared when suddenly I entered beta game mode for a minute and when I returned into the actual game I saw that I lost all my units now somehow I grinded some units and used them. Now I have only 18 units left. I entered the practice mode and this bug appeared after which I lost all my units. See. Practice mode is absolutely broken