@proseandpassion Because the UK system has never been proportional. It doesn't matter how many votes you get in total, or there would be more LibDems and Green MPs, what matters is how they are distributed.
Corbyn attracted extra votes in seats where he didn't need them but lost them in seats where they were critical.
This election was very similar overall to the ones before, but the distribution was the difference.
Without #ProportionalRepresenttion of some sort, it's all very silly.