Having worked in a factory making particleboard flooring, there are two grades: General Purpose and Wet Area. I'm guessing you used the general purpose grade? The Wet Area Grade is treated with fungicide, so if you have used that you may have grounds for recourse from the manufacturer.
We used to always recommend Wet Area Flooring for Queensland regardless of where it was used due to the high absolute humidity and temperatures.
I don't know how to treat it now its there, so I'm probably not much help, but if you bought wet area flooring I'd be going back the manufacturer.
Al.
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