In the Austrian legislative election, 2017, the Green Party dropped from 12.4% to 3.3%. This happened after MP Peter Pilz split off along with several others, and the entire youth wing got expelled and teamed up with the Communist Party instead, according to Wikipedia. That's some pretty severe infighting, and in fact Pilz got more votes than the Greens. The President of Austria is a former Green Party chairperson, so clearly this party and its (former) leaders play a significant role in Austrian politics — it's not a fringe party.
What is the fuss all about? Were the fights about policy or just about individual politician's careers? It is unusual that the politician who split off from the original party ends up getting more votes than the party.