Hello there is a bug that occurs when you equip a weapon (shoulder slots), so your cursor gets stuck on the top of the inventory.

Step to do it :

• have a weapon in your hands
• Press Y to equip it
  
  After doing this your cursor will follow the action you’ve just done and will be on the top left of inventory. Right after, you will notice that you can only navigate through the top the inventory ( grey rectangle) and something is preventing from going bellow.