Hi,
I had some pictures uploaded in the media library, and the portrait pictures were shown in landscape. With the editor in WordPress I tued them 90degrees.
When I use Chrome, the tiled gallery I used in the post, is showing the pictures wrong, portrait, but using the original picture not tued.
When I use Firefox the pictures are shown correctly.
When I deactivate Tiled Galleries in JetPack, the pictures are shown correctly. My conclusion is: there is a bug in Jetpack, tiled galleries.
Is this a bug?