You can see by the top stringer of the railing that that posts line up (green line with arrows)
I tried to draw it out here a bit. On the deck, at the top of the stair case, the 1st stair should be down a step, not sticking out from the deck surface like it is now.
The right side of the stair is correct. (Although to high) The treads should come to the outside edge of the post, so that the side boards line up.
The left side of the staircase is wrong. If the steps were correct and lower, then the Tread should got to the outside edge (left side) of the bottom post. Currently the stair is lined up on the right side of the post
The railing should be centered on posts on both sides of the staircase. Currently it looks centered on the left and on the outside of the right. There should also be a flat top board on the railing to match the rest of the decks railing.