Script doesn't work when applying filter

[#1]

Hi guys,

I am loading an Excel file into Qlik Sense which consist information on High priority problems for multiple regions:

ORGINAL_PROBLEMS:
LOAD
Number,
Priority,
Region,
Date#(Date, 'DD/MM/YYYY') as Date,
Month(Opened) & '-' & year(Opened) AS Month,
IF(Priority <> '3 - Moderate' and Priority <> '4 - Low', IF(Date <> Previous(Date), 1, IF(Priority <> Previous(Priority), 1, 0)) , '0') as [Unique P1/2],
If(Priority = '1 - Critical' and Date <> Previous(Date), '1', If(Priority = '1 - Critical' and Priority <> Previous(Priority), '1', '0')) as [Unique P1]
FROM [lib://test/QS-Problems.xls] (biff, embedded labels, table is Problems$);

SORTED_PROBLEMS:
noconcatenate
load *
resident ORGINAL_PROBLEMS
order by Date asc;

drop table ORGINAL_PROBLEMS;

As you see I used script to convert data for date and month, sort data and add two IF statements to show 'event free days'.

It works fine until I use the filter , e.g. for Region to show data only for US.

Do you have any idea what I am doing wrong here?