I think this happened around the time when the HoM update came when you could merge character achievements. I added the Marhan's Grotto Exclusive Armor of my Ele in my Ranger's Hall and I got a different looking trophy. Any thoughts on why and how it can be fixed, because it looks ugly and out of place.
It's because the ranger doesn't have that armor set. If you have more than 5 armor sets you can switch them around. Or you can set the HoM to personal view instead of account view.
Remove the account wide setting of your hall with the historian near the entrance.
If you want to see your eles elite armor you have to log in with that char.
And you can always reorder your monument so the eles armor is not in sight.
I displayed armors that each profession has the ability to craft. That way no matter which view I'm on (account wide or character), the display shows my character.