A document name is not appearing in the column when sending a document package.
A document name does not appear and is based on the width of the column. It is sized such that it fits 75 characters by default.
The workaround is to use a shorter document name or resize the columns by dragging the document name cell border to the left or right. If the width is less than that of the text, the text disappears.
Vault Document Packaging Documentation: Working with Document Packages