Help! EAD application transfered to Newark.

My I-140 was approved in last April and my family's I-485s are pending. I submitted EAD application for my wife in February. I just got an email from USCIS saying that the case was transfered to Newark office. I really concern why the case was transfered to local office? Any serious problem? I am in West Virginia. I wondered why the USCIS transfered this case to Newark office rather than to Pitt*****urgh office? Any input will be highly appreciated.