Removing Particle floor board - bathroom.

Hope someone can give me an idea what to do...kinder hit a small hump in my bathroom reno. I was removing the old floor boards (looks like yellow tongue)..until i noticed that the board is nailed between the joist and the frame bearers and stud...ie sandwiched

I'm wondering is that a normal practice for 2nd story floors, that they put down the floor boards then erect the 2nd story framing on top of it.

It just doesn't make sense , as now if i want to remove it....basically i cant..!

Is there any recommendations from anyone that i can do. Im thinking maybe i should call in a builder to come n have a look.

Thanks in advance.


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