So what was Ukhov's problem? It hasn't been reported in the English-language media, but in other countries the stories say that he was jumping under the influence of Red Bull and vodka. Here's a very rough translation of the first two paragraphs of this Norwegian news article:
The rest of us would drink Red Bull under competition, but a Swedish track official says one competitor drank the Red Bull with vodka. ...Ukhov, of course, finished last in the 12-man high jump competition.
Russian high jumper Ivan Ukhov is one of the top jumpers in the world , but he appeared drunk during the entire competition.