I am running a very simple simulation. However, something weird happens at the beginning of the simulations. It looks like the chair is pulling the monitor towards itself. Or the monitor is attracted to the chair. Why is that?
I tried your file, I found that just following what @moonboots said above in comments should work, but sometimes... it doesn't, and it's weird!
Here is when I tried to "free" rigid body cache, and also to "free all bakes": it didn't work.
Then I tried a trick: apply scale, and it worked, the "screen" mesh fell in a more natural way, but after reaching the floor, it fell downwards...
So, I tried to apply also rotation, and in this way it worked how you probably expected:
Applying transforms (particularly scale and rotation) is always recommended when you simulate physics in blender, and most of the times it solves even weird issues like this one.
Such phenomena have to do with gravity (it is ca. 9.81 m/s^2) and mass. Check if the screen is heavier or, for one of the monitor's legs, gravity is more than 9.81 m/s^2. If either is true, give all parts of the monitor the same mass and the same gravity and see what happens.