Video from gig get's squished

[sergio_leonardi]

Hi guys, hope you all having a great day!
I have a question, maybe you can help me out with this one
I've added a video to my gig as a presentation in 1280x720, but when the video gets uploaded, it get's squished a lot, to like a 4:3 aspect ratio
You can see in the images that the preview looks great, but when you play the video it changes the aspect ratio of it 
Any ideas on how I can fix that? it makes the gig looks really unprofessional

Thank you!