EDIT: We have fixed this issue in the version 20.1. Please update your game!
We are aware that in some cases the Titan/War Loot popup is not shown and the loot goes straight to your inventory. This is usually caused when a player closes the game or is outside of the main screen in the game when the loot is distributed. We’ll be fixing this for the next update (version 20.1) so the popup will be triggered again if it was not viewed.
Please note that you do get your rewards even though the popup is missing. Our apologies for the inconvenience caused by this!