Can't use filtering with value 1 (number), works for other numbers.

Hi, I have problem that I have column where I have two values: 1 or 2. This data is coming from some server. When I write column?.setFilterValue([2]) everything works perfectly, but when I set the value to [1], which exists of course, nothing is changed, both rows with 1 and 2 are being shown. What is wrong?