The wrong user is displayed as the asker on the question list, the right one being shown on the question itself. This just happened moments ago...
I think I finally understood what is going on here.
For some reason, the behavior of the "Active" questions tab is diffferent than all the others : it shows the person who last responded/edited/commented on the question, whereas all the other tabs show the asker.
The reasons for this are understandable, in that if your are looking at active questions, you might as well show the last active user.