This doesn't strike me as odd in the slightest. When you go out into a crowded room with a lot of conversations going on, your brain will filter out a lot of it, but there is one thing you'll always always always hear, and that's your name. Your 'name' includes anything used to refer to you, like nicknames or pronouns.
Your brain develops special circuitry to recognize your name, and it strengthens with use. It's almost like a reflex.
I don't know how long you've gone by "Eshe," but it will be a long time before your brain develops those same shortcuts, if it ever does, and the old ones may never go away entirely.
My store has shift work, but does it in a sane way. The people whose schedules could change bid for schedules on a week by week basis, and they're awarded by seniority. In theory, you could get stuck with a closing shift going into an opening shift, but in practice it never happens because all the opening shifts get snapped up by the senior employees every week.