That's the $100,000 question. I'm not an expert on Hungarian politics, but I suspect that Orbán might be involved. It's very much in his interest to divide the opposition. This was a similar tactic used by Milosevic in Serbia in the 1990s, where they would sort of buy off certain members of the opposition basically to encourage splits in the opposition and prevent any kind of unity.
I should also add that the EU has played a pernicious role in Hungary partly because of Hungary's membership in the European People's Party. At the European level, there's been very little pressure on Hungary to democratize. I think the EU deserves some blame for the failure of democracy in Hungary.