According to paddy power themselve they got things wrong 3 times in 2016 on brexit on leicester city winning the premier league and on trump1.
The 2016 US Election

Following on from a flood of allegations against Donald Trump arising from what he said on a tour bus show years ago, we thought the billionaires’ campaign was over and decided to take action.

A week before the election we paid out Hilary Clinton being the next president of the United States, meaning any customer who backed Hilary got their money early. This $1 million pay-out got a lot of attention and ended up back firing in spectacular fashion.

Trump started the election campaign as massive 100/1 outsider (November 2012-June 2015) but saw his odds freefall to as short as 13/8 (May 2016) at one point but revelations halted his momentum and caused his chances of victory to plummet like the value of sterling, resulting in chunky odds of 9/2 (representing a 18.2 per cent chance of winning, as of October 20).

Throughout this time Paddy Power punters piled into The Donald and availed of some serious chunky prices.

With Hilary backers already paid up the morning of the election was a dark one on the trading floor of Power Tower as the total loss for the US election came to $4.5million.
iains do not count your chickens you mightlose yoir eggs