Floorboards popping up

Hi I need to pick some brains here. Attached are two pictures of my problem.
I have a floating bamboo floor (tongue and groove). As you can see, one board in the middle has popped out of the track. Due to the tongue and groove system, it has started pulling a couple others out of the track. Naturally, the problem is right in the middle of my condo.
I'm trying to figure out how to get these into place without breaking the existing pieces (the builder used flooring from a special order from China) and I can't buy a box.
I've thought about using a block to hit the piece that is popped out backwards (away from the camera) and hopefully find the groove. Like I said, I just want to pick some brains before I start hitting away. Thanks.

 

Do you have any idea what has caused your's to pop? If there is not a big gap between boards I suspect the installer did not leave space around the perimeter of the room for the flooring to expand. Does it look like the boards squeezed together forcing those boards to pop up?

I don't think simply hammering the boards down is worthwhile until the underlying problem is solved. If you hammer them down they are likely to pop right back up. I would remove the base molding along a long wall that parallels the floor boards (maybe from where the pictures were taken) and see if the floor boards are hard against the wall. If they are they should be trimmed to allow room for expansion.

 

The parallel wall from behind where the picture is taken has the heat register so it was easy to take off the skirting and have a look. There is an expansion gap there. Do you recommend looking behind the baseboard of all walls parallel to the popping?