Are you doing it manually or with the plugin I made?
If with the plugin:
Only reason that comes to mind was the mistake that another user made, of using one AC item as one of the two items (Both need to be non-AC) required to do the glitch, or maybe you wrote the name of one of the items wrong.
If its not one of those two reasons, then what is happening when you click the bank items button?
If manually maybe you are not doing it quick enough.