@alriksson
Lazy Load has to load first or it cannot apply the feature to the images or anything else that you have it applied to.
I am not sure what features you are using but here is a full list of the a3 lazy Load Scripts that will load if all features are on and you are using load by AJAX
/wp-content/plugins/a3-lazy-load/assets/js/jquery.lazyloadxt.js
/wp-content/plugins/a3-lazy-load/assets/js/jquery.lazyloadxt.min.js
/wp-content/plugins/a3-lazy-load/assets/js/jquery.lazyloadxt.srcset.js
/wp-content/plugins/a3-lazy-load/assets/js/jquery.lazyloadxt.srcset.min.js
/wp-content/plugins/a3-lazy-load/assets/js/jquery.lazyloadxt.extend.js
Regards
Steve