Once a sequence for inventory is established, (5 across) when mounting a horse the inventory sequence (4 across) is scrambled. This appears to be an issue with the iPad client, Windows 10 client does not do this.

Steps to reproduce:
1. Collect 10 items, or more
2. Locate and open a chest
3. Move all items from inventory (not from hot bar) into chest
4. Establish a sorted inventory, by selecting like items from chest one after another (e.g. Select Oak, Acacia, Spruce, etc. woods. Then select Cobblestone, Diorite, Granite, etc. stones. And so on, to establish a sorted inventory)
5. Close the chest
6. Open Chest again (order is correct)
7. Change the order of items on hot bar
8. Close Chest
9. Locate and mount a horse that will allow you to sit on him
10. Open your inventory
11. Notice the inventory has not maintained the established sorting order
12. Exit the inventory
13. Dismount the horse
14. Open your inventory
14. Notice the inventory has not maintained the established sorting order.

Expected Results: The sorting order in your inventory should not be changed by changing the order on the hot bar and opening the inventory while on horseback.