Yes, there are configurations for each filter and you want to select "Verify Filter". This will do two things:
a) If a filter with Verify filter is applied and the resulting data set is empty, then NPrinting will not generate a report. This can be used to do conditional reporting.
b) If a filter without Verify filter is applied NPrinting will try to select values that do not exist in the .qvw. In this case QlikView enables all values so NPrinting will generate a report with the unfiltered dataset.This is the result you are seeing from your misspelled filter.
See the "Set Filter Parameters" section of this document for more: How to Create Static and Dynamic Filters Based on Fields – Customer Feedback for Vizubi
If a filter fails, it is treated as if there is no filter at all. If the field you are using for your filter, such as region, is a dimesnion, it is best you define you filter and pick from the selected values. That will always ensure the value(s) for your filters are correct.
There are even circumstance where I ahve worked with users who have created dimesnions just for NPrinting reporting
In the Qlik application, can you filter by this field?