If the wood is sopping wet, I'd imagine there's water coming from somewhere other than through the grout. Keep removing tiles up along the wall to the shower and locate the source of the water, it may be a dodgy fitting at the back of the shower.
Are you sure this was Sealux and not another brand? Sealux's own sealant should be used with the trim as these have a strip underneath designed to form a good bond with the sealant. Of course a product is only as good as its application, these all need to be applied to a dry, clean surface.