As far as I am aware, differing aircraft sharing the same registration are listed alphabetically, thus Advance before Eipper. Where several aircraft are listed, this makes it easier to find a particular aircraft in the list.
In this respect, the system does not differentiate between registered and de-registered aircraft.
I corrected the images in question a day or so ago when recognising that the photos were wrongly attributed.
Whilst sympathising with the problem you have once again outlined, I am not aware that other members are experiencing the same problem.
Having entered the registration in the upload page, if there is more than one aircraft in the database having this registration, a box immediately below the registration field will open up listing the various aircraft sharing this registration.
Clicking on the appropriate aircraft in this list ensures that the image will be uploaded to the correct profile.
Malcolm.