What is causing my wood flooring to rise and separate?

Solid wood floors should be installed with MS polymer adhesive to the subfloor which should be flat and level. Installing the floor floating will always have a risk of the floor to move. My answer to the problem is, if it is possible to remove existing floor and sort the subfloor out and fit it with adhesive.

Was the floor laid as a floating floor, or glued down? Also, is the floor a solid wood or engineered wood floor? It may be possible to remove the bit that has lifted and re-lay this - although it depends what adhesive is on the boards/between the tongue and groove (if it has them). I would suggest that you get a professional to take a look and guide you - I don’t think it will require the whole floor being taken out/replaced.

It could be due to a leak from the underfloor heating system. The only way of fixing it is to get it lifted where it's rising and separating and then to sort out the leak. You would just have to replace that section.

There are many reasons why a solid oak for a wooden floor is raising one the pipes under the floor are they leaking two the floor when fitted it needs a expansion Joint from the wall 8 to 10 mil all the way around as solid oak flooring needs more than engineer flooring three cleaning the floor if the floor is not sealed properly and is moped water and wood floor’s don’t go together as the floor will absorb the water and Expand also nothing wrong with a floating solid oak floor as long as all the joints are glued it also helps a little with water getting into the joints it’s stops water getting into the bare wood. I hope this helps