The MDF core of the laminate board has soaked up the water near the joints, this in turn has caused it to swell. There is nothing that be can be done to save the situation apart from replace the the damaged boards with new ones, or if you're lucky, pull up the floor and refit, using the damaged boards under furniture so that they will not be seen. If the whole floor is damaged, your washing machine leak was worse than your realised and you'll have to replace the lot. Try your home insurance..
Rupe
May 2010