Exactly. I'm sure it's to do with IT issues and alignment of fare classes, which isn't uniform in one direction. Example: I recently booked an economy class LH flight on the UA codeshare because it was cheaper than booking it on LH flight numbers. Somehow the fare booked into premium economy on LH (speaking to the fact that fare designations aren't perfectly aligned). Then I got an op up into J at the gate (no status on either airline).