The probability of calling out 3 names and 2 of them being mafia isn't exactly low either, it's roughly a 1 in 12 chance after all. If you had been calling out names while making your excel (which seems to indicate that you have done this 55 times) then I would be more surprised if you failed to call out mafia rather than you succeeding.
Either way, the distribution of roles is random, any perception otherwise is the result of confirmation bias and the nonrandom distribution of night 1 killings.
In fact, what I think would be far more interesting is to see what roles die night 1 rather than what roles are evil.