It's an AS issue in that OP is crediting to AS. I just requested original mileage credit as I was downgraded on an AA flight from first to economy and it posted as such. Called AS and the agent sent me an email requesting a copy of the original itinerary. I also sent the canceled boarding pass even though she said she didn't need it. She called me back in 5 minutes to confirm the booking class and to say she fixed it. She also noted that my flights on BA from the same itinerary hadn't credited yet and if they didn't in 14 days just to reply to the email again so she could credit them.

AS should take care of this and it's not OP's responsibility to contact CX unless they credited to the wrong place.