Welcome back to the community, @hakan_cetinkaya! Could you share with me the following through a private message (so that I could have a closer look at your case):
@hakan_cetinkaya, could you share with me the exact variable name that is having issue as I could not figure out the variable (as the project was in a different language other than English). Maybe it would be helpful if you could also provide me the variable name in xml value instead of the label and at the same time provide me the column number of the variable.
When “isyeri_faaliyet_alan_1” is selected, “isyeri_faaliyet_alan_19” also appears on the filtered list.
When “isyeri_faaliyet_alan_2” is selected, “isyeri_faaliyet_alan_21” appears.
Column Number: 6 (including Validation Column, Start Column and End Column)
(when writing out like this I wondered if the filter is working with the xml values like filtering “XX1” would also show XX10, XX11, XX111 xml values.)