I can't reassure you that it's done fairly, but I can reassure you that 1 in 12 is not statistically significant, or in other words you can expect to come up with that result by chance pretty frequently.
Also, at my club, the rate is a good bit higher than that, for what it's worth. And the probability is nearer 1 in 5 too, I think.
Quite a few people come up with theories (like the one about not putting down 4 hours expected time because too many people do that) but the FLM people say it's random and there's really nothing that could be considered evidence to the contrary, so you may as well believe it.