Current status is not equal to Empty Returned.

(I used script builder so not mentioning the deluge stript)

Till yesterday it was showing all records in which Current status was not "Empty Returned"

But I could not see any record in the views today.

Then I had to change the criteria and remove this "not" and gave the condition of matching any of the all other Current status. Then only it worked.

Why is it that the criteria with "not equal to" in the condition stopped working. Even I had a custom filter with same condition and that also stopped working