Toxic keeps 1-hit KOing my pokemon??? this didn't always happen, why now? I don't know if it's an error or not, but I hope it is because I like the old way better!

its not ko ing my pokes at all. must be a glitch. try loging out then back in may work then

Sometimes toxic does this because your pokemon are far weaker than the opponent. Not a glitch, just how the game is.

i think its part of the game

not the part of the game at all. toxic takes away 105 of the total hp, it can't ohko your pokemon at all. even if opponent pokemon is level 10000 and your pokemon level is 5, it still won't get ohkoed.
proof-you all have battled mysterious trainer? his pokemon are 10Xyour strongest pokemon. so, when you guys use golurk, and it poisons you when you are at full hp, how much damage it does? calculate and see for yourself.