When importing a CSV file, the CSV file has a value in a field, however Rally shows it as empty or blank when looking at the imported work items.
This can be caused if there is a duplicate field name in the CSV file that has an empty value.
For example, the following CSV has two Notes fields specified however the second one has a blank value.
"Name","Description","Notes","Owner","Notes",State
"Test Name","Test Description","This is a Note","[email protected]",,"Open"
Remove the extraneous field name from the CSV file