Selecting Back When Viewing a Popup Closes the Entire Menu

When attempting to dismiss a popup, the entire menu closes instead. Some examples of this include:

• Vending Machine - "Sell Equipped Item"
• Specialization - "Loadout Incomplete"
• Respec menu - "Confirm Changes"
• Bank / Inventory - "Deposit Equipped item?" 
• Bank / Inventory - Inspect Item