How do i get this part to match up with the other stairs?

I want the bottom left stair to match up with the other ones but I made some mistakes when making the whole thing a component. I now have 3 components.
Components1.skp (98.2 KB)

I think you have mixed up what you are trying to do a bit. Easiest thing is to make the staircase from an array of stair components.
Here I have use the stairs#1 component which is the plain block to set out the array of stairs, then modified that block to get the shape you want. You can then wrap all the parts up into a parent component ‘Staircase’ for example.