I downloaded “Futurama.S02.E10.1080p.x265” and see that it has 1440 x 1080 resolution.
This is a “special case” because this resolution can be played in proper 4:3 format or in proper 16:9 format if anamorphic aspect ratio is used.
This sample plays correctly if you in go to Video settings and set "View mode => Stretch 4:3. No need to play with pixel ratio.