[Gameplay] Sej OP does 12000%? (2 month ago bug)

Well this happened about 2 months ago, probably long fixed by now or probably not so i dont know. I had this great game going as sejuani, just stole baron and got a triple kill. Then i decided to go back to base and buy myself a Warmogs. Went to go level up my Q and panned over my w for a quick second to see the new hp scaling damage i would have. Well I got kinda freaked out when i noticed that my W would now do an unimaginable amount of damage. Also i noticed this happened RIGHT after i breached 6k HP with barons buff. So then i decided to try it out on a jungle camp, neverthess the camp blew up instantly. Then i told myself that if i used it on a champion to win the game then i would be banned for hacking or something because saying it "wasn't my fault" probably wouldnt cover me. We still won the game but this happened only 1 other time late-late game the next time i played sejuani, broke 6k hp and had baron buff. Iv'e been scared to upload this picture because I didn't know if i would get banned or not. It did happen in ranked but the second time was completely unintentional. Just decided it was worth it to throw it on the board and let everyone see this messed up game. I took the picture on my phone so its a tad off to the side.