XB1X:

I found this one because of my children making unauthorised purchases on my account, I went to the marketplace to search the most recent purchases, and the order that it is in is incorrect, I know this for fact when I found two of the purchases I made together where seperated by several rows, that also goes with the Christmas event items from a few a few winters ago.

On the XB1S on another account the order list is not correct either.

Android: Same situation with my main account

How to recreate: 

Go to marketplace in game > [Player name's] Packs > click sort > select Newest First/Oldest First 

It should be out of purchased order