Thanks for reaching out. I have confirmed this bug and fixed it in the latest update which should be available now.
If you dig the plugin, I would love a 5-star rating and review! http://ww.wp.xz.cn/support/view/plugin-reviews/envira-gallery-lite#postform
Also, if you are interested, there is a pro version of the plugin as well that offers more features and flexibility: http://enviragallery.com/