Remove-PWEnvironmentColumn - possible issue related to removing columns

Hi all, I'm seeing an issue after removing columns from an environment using Remove-PWEnvironmentColumn.  Seems that something is left behind in the database after deleting columns that causes adding the column back to the environment with the same name causes an error, from the administrator client and from the cmdlet for Add-PWEnvironmentColumn.

error,

WARNING: Error modifying table: 56051
WARNING: Failed to add column 'TEST3'. Error: 56051

#Step 1, Add Environment Columns
NEW-PWLogin
Add-PWEnvironmentColumn -EnvironmentName "Example Environment" -ColumnName "TEST3" -ColumnType 'text' -ColumnWidth 32

#Step 2, Delete Environment Columns
Remove-PWEnvironmentColumn -ColumnName TEST3 -EnvironmentName "Example Environment" -Verbose

#Step 3, Add Environment Columns
Add-PWEnvironmentColumn -EnvironmentName "Example Environment" -ColumnName "TEST3" -ColumnType 'text' -ColumnWidth 32

any help would be appreciated,

thanks
Craig