Board Thread:Current Major Glitch Discussion/@comment-29787173-20161220161541/@comment-26112541-20161229180804

Is it possible that you cashed in on this collection when the game displayed the

"Congratulations, you have gathered the collection....."

dialog box before you had actually completed the final reindeer task? This is possible if the Collector Award dropped that last reindeer earlier, or if when Visiting friends it was dropped there. If either of those things occured, then you would have seen the congratulatory message after the 4th item, and may have been drawn into Combine'g the collection.