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Well, the media may be the wrong grade (too fine or too coarse), or you've used way too much polishing compound. Or possibly you're having severe humidity/moisture issues.
If you have any fresh media left, I'd run a batch with no polishing compound and see if you still have problems. For corncob media, I use the relatively-cheap Frankford Arsenal stuff. If the pet store is your only option, Zilla sells ground English walnut shell media for use as reptile bedding, and it makes a dandy polishing media. You can look it up online under the name "lizard litter".
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