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I ran into this today with the mac client, but I'm fairly certain I also ran into it on the pc side a while back.
In any case, I have a large ignore list. I accidentally put someone on that I wish to remove. I go to the ignore list, click, select unblock. It unblocks not that person, but a random person on my ignore list. I tried over a dozen ignore removals, and I can find no actual correlation. It just seems to randomly pick one person and un-ignore them.
So basically to un-ignore this one person, I had to also un-ignore a dozen other people I really *wanted* ignored. Obviously, this is a problem.