WiX Help!!! I am no coder. Why is my 444kb video loading as 3.3MB?

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My site:
https://terrakeeshure.wixsite.com/alu-demo

The video:
I uploaded to Wix. Size: 444KB

Load speed test:

Tells me video is 3.3MB

Right now the load speed is really bad, how do I get it to not do this? Why is it happening?