Teemo's poison has a bug

i've only seen it in the new SR in bot matches its when I plant a shroom, the enemy bot steps on it, then I auto them so they are under the effect of my E the poison mark will stay above their head. the poison will stop depleting their health, but the mark is still their. also, if the enemy is in my sight range, then i click on them. The little tab in the upper left corner will pop-up with their build and stuff. under it it has little squares where it shows any effects (ally or enemy effects). the poison effect square stays there as well usually it will stay there until i auto-E them again, so it kinda resets the effect.