CloudFront strange behavior

I spent a few hours on a AWS CloudFront problem, hope someone can save me :D

When i load the site homepage, for every assets i get (on each reload):

X-Cache:Miss from cloudfront

When i try to open an asset in another tab, i then got the correct behavior (miss on first call, then hit on each reload). Same with curl requests.

I reload my home and inspect the same asset, i get:

X-Cache:Hit from cloudfront

with a similar age as in the tab.

Then i reload my homepage and inspect the same element again:

X-Cache:Miss from cloudfront

:'(

And from this point, when i reload the asset in the other tab, i get a miss...

Any idea ?

Thanks,

Jérémy