获批的状态为何显示的不同

请问EB1A获批会出现两种状态：1. Case was approved and my decision was emailed; 2.  Case was approved
我的是先出现Case was approved，然后几个小时后变成Case was approved and my decision was emailed。但有的朋友一直都只是Case was approved，但大家都是同一个申请流程也是加急处理的，为何会不一样的状态呢？
谢谢！

大家有遇到这种情况吗