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You can check the filter of your workbooks anytime.

Just click on the button "Details" (1) and select the name of the filter which you can see here (2).

JExcel > Filter of this workbook > image2017-5-8_14-42-15.png

Clicking on it will take you to the Issue Navigator and shows you the filter you are using:

JExcel > Filter of this workbook > image2017-5-8_14-45-22.png