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There is an anomaly that shows up periodically when placing items into, or taking items out of, the bank.
Usually, either changing maps or characters, logging completely out of, and back into the game, or just waiting a short period of time (up to a day or two), will alleviate the issue.
If you continue to have difficulties, you can contact the CS Team through the link found at the top or bottom of this page.
Good luck.