how to edit overcranked video? 1440x540?

Hi, i'm new here
I'm a rookie, :> so this is my question
I have MXF files that I shoot using sony XDCAM HD 355 with 50fps,(slow motion)
but why my aspect ratio frame size is 1440x540 (0,66) and not 1440x1080(1.33) ? and how can I edit it? coz my other shot was at 50i and the frame size is normal 1440x1080,
please can you guys tell me what NLE support that 1440x540 setting?
when I try to resizing it, my picture is full of artifact etc
when I try to open on Premier pro cs3.2, with XDcam 1080 50i project preset, my picture with 50i is in normal frame size, but my overcranked (slow motion) picture the frame size is very small....
please help....

thanks