I’ve just gone to add the Sabine Rich variant Virgin for Demon Days: Mariko and it’s come up as Demon Days: X:Men. Seem to be the same cover but with different Titles on the issue but are coming up in the incorrect series. My Mariko issue is coming up under X:Men and my X:Men issues are under Mariko. I’ve updated from core and nothing has changed.
Looks like this variant was originally intended to be for X-Men but ended up going to Mariko. What we had was preview art for the exclusive. Has now been corrected! Thank you for letting us know 