So you know how bricks aren't lined up in neat rows vertically? You need to stagger the courses of flooring in the same way. Also you need to leave an expansion gap around the perimeter of the entire room for when the wood expands. Also did you let this flooring heat up in the room for a full day before installation? Not letting it acclimate can lead to this but the most likely culprit is just not lining up the joints like that.

I did not do this installation, so any history of the install would be speculation.

Well you can see the courses are wrong just from the picture so you should fix that first. It's fairly easy to do since one is already popped up.

To figure out if there is an expansion gap just take off one of you base boards. There should be a centimeter or so gap near the walls. If there isn't that's going to suck a lot more than just redoing the pattern since you might have to start trimming an edge or two of the entire room.

Unfortunately there is no baseboard to speak of in the bathroom. Here’s a better picture of the floor meeting the wall. This extends all around the room.

Yeah, it looks like whoever installed it didn't know what they were doing. You should be able to fix it fairly easy but it's going to have to be the whole floor since there doesn't appear to be a gap. You'd have to pull the whole floor up and reinstall them all making sure to leave a 0.5-1 cm gap around the perimeter. The person probably didn't leave a gap because it will look like shit and stuff will get in it since there is no baseboard. A better option might be to pull it and put vinyl planks in there instead of laminate. Vinyl planks have less thermal expansion than wood or laminate so you wouldn't have to leave an unsightly gap or install baseboards.

Is this not tile?