Just an update. I went into work (I work at a petsmart) and talk to our resident frog lady and she thinks that the container was messed with and contaminated by something. We carry another brand of Calcium dust (Repto something or other) so I think I'll pick up a container of that latter this week.

Thanks for everyone who read this and for trying to think of anything it could have been. I'd suggest if you use the same brand of calcium powder and you bought a container of it recently in the central illinois area you should keep an eye on your own frogs just in case mine wasn't the only one contaminated.