Users with gold tag badges can close a question as a duplicate of multiple other questions. When they do so they can also set the order that the duplicate displays in. I recently closed a question and very deliberately arranged the list order:

Screenshot of closed question

However when I open the question in the iOS app, the duplicate order is reversed:

Screenshot of question in iOS app

  • 3
    Obligatory comment about no one working on the app... – Alex Oct 29 '19 at 12:19
  • Already reported by other Alex, and even had the honor of being rejected. (Since 99.999% of the bugs/requests are just ignored.) – Shadow The Vaccinated Wizard Oct 29 '19 at 12:26