drupal.js is loading before jquery.js
May be because of cache that might cause 


Check if you installed jquery_update module 
in themes info check if there you have declared jquery

3.check if in any module hook_init() you are adding your js with weight. 


if you install jquery update module you dont need to add jquery plugin in info file 

if you have any clarification regarding the js weight and so on read the following links will be helpful 

https://www.drupal.org/node/756722

https://www.drupal.org/node/304255