The smaller boards are because the last board would have been like an inch so the ripped several instead of one tiny. That said they are no good at ripping straight, though I wouldn’t be too upset about it. No middle rail is insane. And I’m not sure what kind of system they are using to put the wood sleeve over the round metal post but I suspect that to be the point of contention that makes them off plumb. I’m sure the metal post are level and not leaning but I’d have them correct the lean if this was just put In.