no, that's 5 repeated numbers, the first selection of each does not count as a repetition. the probability of observing exactly 5 repeated numbers in a sample size of 20 with selections made from a range of 1-100 is roughly 0.15 (1 in 67), which i wouldn't exactly call miraculous. now, if you observe this many times with a much greater frequency than 1 in 67 then perhaps we could start questioning the efficacy of mIRC's $rand().

mIRC's random functions are at least as effective as C's rand().