blueimp loads all images rather than only from selected gallery

It’s possible with the Gallery, but not currently via the WordPress plugin:
https://github.com/blueimp/Gallery#container-ids-and-link-grouping

Here is some temporary solution.
You should replace 110th line
$lightbox_attribute = $this->options['lightbox_attribute'];
of file lib/class-blueimp-lightbox.php with following code:
$lightbox_attribute = $this->options['lightbox_attribute'].'="#post'.strval(get_the_ID()).'"';
It should divide galleries of different posts.