Why is my video getting cropped?

I am exporting my storyline course as a video, and I don't know what I'm doing wrong that is cropping the video output. I have the slide set to 1920x1080, and I have selected Story size dimensions as the output option, and I'm getting a 1920x1080 video, but I don't understand! The sides, top and bottom are cropped! (my real problem is with he sides). It's like it was zoomed in...

When I preview in storyline, it looks perfect....

Help me please...

 

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