From what I could tell, you have your pictures in wp-gallery, as the picture links on individual pages link to the right picture if clicked but you are calling img
tags for: ./wp-content/plugins/lazy-gallery/lazy-img.php?...
so there must be something in what you have in your plugin that is looking somewhere different for the thumbs, not coded right, or something.
I’m not saying that is it for sure, but your pictures are in a folder at the blog root, and your plugin is in the plugins folder. I don’t know what your plugin is like, but the gallery types I’ve used reside pictures in the same place as most of the plugin files, or have a specific config file to put the path to pictures and/or thumbs, etc.
So check into all your plugin files for paths and such that need to be changed.
Just ideas to explore.