It is the situation where an opposition candidate had a chance to win but Klitschko, Yatsenyuk, and Tyagnybok could not agree on leaving a single candidate. Udar's candidates were the ones that got less votes that Batkivschyna or Svoboda candidates.
There is only one single district where Batkivschyna candidate clearly ruined the victory for a more popular Udar candidate. And no such cases with Svoboda candidates.
Here is the situation where opposition could have won provided there was a single candidate (total opposition votes in red):