Here is how I fix cupboards that have swollen particleboard areas like cabinet doors. You can repair them if the edges have not expanded to the point of ruining the sides of the door.

You are going to need to get some lacquer thinner and have some type of squirt bottle to put the liquid into. This will be used for separating the glue from the two surfaces. read How to Fix Swollen Cabinet Doors

The best way of fixing kitchen or bathroom vanity cabinet doors properly, that are out of alignment, is to step back and take a good look at all of the doors. Study the cupboards and image what will happen if you adjust one door; how will the other ones need to be adjusted. read Fixing Out of Alignment Cabinet Doors