DOC items have a specific document filter field where you can select a filter for the document downloaded.
These filters can be negated by double clicking
If you have selected such a filter, the Download document button will indicate this by warning symbol, because the downloaded document will not indicate which labels have been used, but just filter the items shown.
Note: when you download such document with a filter enabled, the download progress bar won't be green but will appear in orange:
When a DOC item has a document filter set, and a SIGN item is created from this the SIGN item will take the filter into account.