Custom Wordpress Widgets Disappearing

We recently launched a newly created Wordpress site hosted on Amazon Web Services. Twice we lost the custom widgets when we transferred the files from the WP development firms server to AWS hosted environment and a 2nd time when we migrated the site into Production. Has anyone had any issues llike this.

We have a couple of web servers hosted at AWS managed through a load balancer. We also installed a Cache plugin to propagate the changes as they are published from the primary WP server. We think there might be a bug with the Cache.

Anyone have any thoughts or comments