I'm not sure what kind of bugs they could be, but if they're not on your snakes like mites or ticks I'd guess spring tails. I also use bark but before I put it into the cages I soak it in boiling water and the rinse an drain it, this makes sure that it is sterilized and free of bugs, plus it rinsed off any dust and fine splinters. This is also why I prefer bark to other substrates.
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