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Under investigation by the game team
When Upgrading Guild Wars Sentinels it will appear as if the purchase is not correctly applying. The Sentinel Bonus Symbol will not move from the right side of the menu to the left to indicate that it has applied, even after spending Glory, Gold, or Souls to upgrade.
Fixing the problem
This is a visual issue only - for your Sentinel Upgrade to correctly apply, purchase your upgrades then close the menu. Open it again to see the bonus correctly applied. If you spend resources to upgrade more than once in the menu, the bonuses will still correctly apply.