Bug Can't change name back to original

Im using the username change with your store addon. After a members changes their username once, if they try to change their username back to the original name, they get an error that says,

"the username is in use or does not meet the rule requirements. contact the admin"

This is from the Inventory page from the store.

The username was not in use and there were no restrictions that should have prevented them from changing it. Ive tested it and they can change the username to a 3rd unique name, just not the original name. Any ideas?

This is due to the "Username Re-Use Delay" setting in the vBulletin Options. This is a default vB feature that this mod respects.

oh, I didn't even know that setting existed. Thanks