tiled gallery, broken images

Good evening!

On my blog http://blog.sushimousse.net I have jetpack and I use the tiled galleries.
It used to work perfectly fine until the last WP + jetpack update.
I did both at the same time so I don’t know which one created the problem.
Now, my galleries are displaying only broken pictures : the gallery is calling for example https://i1.wp.com/blog.sushimousse.net/wp-content/uploads/2016/11/IMG_1009989.jpg?w=446&h=297&crop which gives a HTPP 400 error
When removing all parameters, https://i1.wp.com/blog.sushimousse.net/wp-content/uploads/2016/11/IMG_1009989.jpg works and the picture shows up
When calling the first url again, it now works……!!
So I tried again with another picture and this time when I opened https://i2.wp.com/blog.sushimousse.net/wp-content/uploads/2016/11/IMG_1009239.jpg?w=609&h=406&crop in a new tab it showed up right away.
But still, all other pictures in the article gallery are broken here apart from the 2 pictures I opened separately http://blog.sushimousse.net/2016/12/07/decath-color-run/

I don’t really feel like calling all my images manually (or even with a script) to have them showing up again.
I guess it’s something to do with my settings as I don’t see hundreds of people here complaining about the same issue…
Just to be sure, I have currently deactivated ALL my plugins except jetpack.

Any ideas what is wrong and how to solve it?
Thanks in advance for any clue, this is totally puzzling me!

The page I need help with: [log in to see the link]