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They all seem to be at the bottom of the page.
Page 3 there's three spaces, Page 6 there's one , Page 7 there's one, Page 10 there's three, 13 has one, 15 has three. I went back twenty pages and those seem to be the only ones.

I figure it might be a glitch or something, then I read about the tag blacklist and thought that it may have been activated. No idea really, but wanted to see what is going on.