Custom Wordpress Widgets Disappearing

We recently launched a newly created Wordpress site http://www.zestra.com 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

Thanks,
Jeff