I noticed that on the manga Wolf Guy - Ookami no Monshou, on the latest releases it writes, that all the releases came out yesterday though they were released earlier and not on the same date.
On other series I read didn't notice this bug

pics:
the page as I see it today (03/10/12)
http://oi42.tinypic.com/xbydub.jpg
the dates of the releases
http://i41.tinypic.com/jr74as.gif

It lists the date the release was added to the database, not the date of the actual release.
It's not a bug

A just ruler amongst tyrants