Why does MWF contract so much when not used?

I've used MWF for several years and really like the soap.
I tend to use it as a summer soap with cold water, I like the clean soapy scent in hot weather.
During the winter off months it shrinks a great amount in size as it dehydrates.

Why does MWF contract so much when not used?
Yes, it makes sense that as water leaves the puck it would get smaller....
but none of my other soaps (Tabac, DRH, Velobra, etc...) exhibit this extreme shrinkage when left unused.

Is there something about the MWF formula that accounts for this?

Thanks,
Curt

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Why does MWF contract so much when not used?