Gallery Tiled mosai on left

Try defining a $content_width value in your theme, as explained here:
https://jetpack.me/support/tiled-galleries/#content-width

That should make the Tiled Galleries look a lot better.

Dear Jeremy, thnaks very much!
I solved withyour suggest, I installed the plugin
Custom Content Width
https://www.ads-software.com/plugins/custom-content-width/