If I change the operator to something else (from <= to < in my example) and then leave the Operator field (hit tab,or select a different field or row) the Field and Filter Value columns change.
I just did a test in 10.2.400.15 and it is still there. It is not just changing the operation. I always glance to make sure there are no company fields since that it what it flips to and I would never use that as a criteria.
I have also been dealing with this since I started about a year ago. I haven’t found any good way to avoid it. I would love to hear some workarounds or solutions!