I have got the Asus Maximus XI Code motherboard and the Corsair 500D RGB. I aligned the long standoff in the middle of the case with the motherboard and as you can see in the picture the motherboard holes don't align with the "normal" standoffs. The only ones aligning are the bottom three. I think the problem is that the IO of the motherboard can't quite fit in the "IO opening" (I am sorry I don't know the term for that, my english is terrible) of the case (second picture).
If anybody could tell me what I am doing wrong, I would really appreciate it, thanks.