Stoneskin stopped working

I cast stoneskin on myself when working to level my Chocobo. When I was attacked I still took damage even though the stoneskin animation showed up that it blocked. My imagination? Nope. I have fought 3 mobs so far with the same stoneskin but damage is taken and it won't go away. I have cast stoneskin but that hasn't changed it. Decided to screenshot and post the bug here before manually canceling it.

http://img713.imageshack.us/img713/3154/tn9x.png

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Manually removing and recasting did fix it, however that it happened at all bears looking into. Masamune Server.

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