It's the first time it has done so, and I'm sure it will be back to normal next week. Bleach has the most loyal fans of these shows, a lot of them probably don't care much about Toonami, so in a night where lots of people watched sport games, Bleach drops less than the rest. Bleach also does well in general in the second slot because a lot of its target auidence might be out that night, and therefore watch it later.
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Nio-chan and Ctes: http://img.imgcake.com/nio/Untitledpngyn.png
BroAndCharAndCtes: http://i.imgur.com/oBQfY.png