IPad 5, iOS 12.3.1

When going to Champions screen and reviewing recently acquired artifacts, selling some will remove all, not just the selected.

This is what I did:

Went on missions and acquired 5 artifacts. 

Went to Bastion screen and chose Champions button.

Chose New tab, checked out the skills of my 2*’s.

Sold my 1*’s by marking them only.

All were gone. Only the single 2* speed armor I already had was in my artifacts, all.