I'm afraid I'm not going to be able to help you, but I'll try anyway.
first, I'm not exactly sure what you mean by 'cropped or zoomed in', because your screenshot's look normal to me. Do you mean the length of the thumbnails? you can change that with these sliders.
if you mean the scale of the clip, maybe check these settings?
there's not much else I can think of to help, do the files play correctly on the camera and/or in quicktime or VLC?
Instructions for deleting the preferences can be found here
support.apple.com/en-us/HT203477