I read that alot of people complained that the holes and the bolts don't align.
I agreed for the first chair.
Then I re-read the instructions which clearly say, "DO NOT TIGHTEN THE BOLTS"
Once I started to assemble them without tightening the bolts it was super easy and allaligned.  Basically the bolts and holes all have slack but you don't know what you need until it is all assembled.  Then you tighten each bolt on each side but again don't tighten, basically do a few turns and go to next bolt and spin chair.  Do this like 3 or 5 times around until fully tight and it works great.

Love the set!