[GAMEPLAY] Lux's E is invisible?

I just went up against a Lux support. The first 5 min in There seemed to be nothing wrong. She threw her E (Lucent Singularity) and i was able to pick it up no problem. we managed to kill her for first blood. However when she came back. Every E spell was invisible! You could BARELY see the warping of light that shows on the outer part of the spell when thrown. However the center part of the spell, the one thats most visible, was not there. Lux was on Red team. Classic skin.