raised floorboards

[shatpank81]

hi
bear with me, im a complete novice when it comes to this stuff
anyway brought an house and got a few issues but this is one of them:
in the spare room, after lifting up some crappy old laminate flooring i noticed a couple of sections had an issue.
they arent the usual floorboards (well what i would called floorboards) they are like mdf sheet in various sizes all over the floor
anyway there are 2 boards that have risen up at the joint into like a peak

is it a case of lifting up those 2 boards and replacing?
and what could of caused this?

whats the best course of action guys? im comfortable doing work its just knowing the best way to go about it

all help very much appreciated

 

[catlad]

Are they chipboard t&g if so they cheap and may have warped due to spillages, if the rest is ok just replace the warped one's.

 

[shatpank81]

they seem thicker and stronger than chipboard more like mdf sheets and not t&g!

 

[catlad]

how big/long wide are they I did not know MDF flooring existed.

 

[shatpank81]

they are about 60cm wide and about 80cm long