Last game I think the enchantments on my creature got incorrectly removed, this happened when:

On my side of the field I had:
Yenna, Redtooth Regent (Enchanted with "Sheltered by Ghosts", Copy of "Lightwheel Enhancements")
Predator Ooze (Enchanted with copy of "Sheltered by Ghosts", "Lightwheel Enhancements")

Both sheltered by ghosts cards had an enemy creature exiled with it.

When the enemy used "Eriette's Tempting Apple" on the Predator Ooze, at the same time as gaining control over my creature, it also decided to delete the copy of "Sheltered by Ghosts" that was attached to it.

I don't see anywhere in the description of any of the cards involved that this is the interaction that should happen. The original card for "Lightwheel Enhancements" did not get discarded.

As far as I can gather from the text in "Yenna, Redtooth Regent"'s ability description, the copy should not disappear if I lose control over the creature it's attached to.