Assets management has been improved in the upcoming stable version. The SonataAdminBundle now uses bower to handle assets (https://github.com/sonata-project/SonataAdminBundle/issues/2036).
So if you update your code, you will need to remove SonatajQueryBundle. Also, there is a new configuration section to add your assets in the AdminBundle. So you can have a fine control on which assets are loaded in your project. (https://github.com/sonata-project/SonataAdminBundle/blob/master/Resources/doc/reference/configuration.rst).
Last point, if you have overwritten the default template, you might need to adjust it to properly load assets.