Open Ground series of outlets

I plugged in an APC surge protector to one of the outlets and noticed a red light on which says site wiring fault. So I plugged in my outlet tester and got open ground. I opened the outlet and everything looked ok two white wire connected on silver side of the receptacle,two black wires on the brass side and one ground wire on the green screw. I then went upstream and all the outlets in the same circuit had open ground. I checked the other outlets looked ok except for one the electrical box had three different wires coming in. The white,black and ground wires were connected separately and then pig tailed to the receptacle with one wire each. Is this wiring ok? could this type of wiring be the cause of the open ground light? I have attached images of the pigtailed outlet. I also went around the whole house and all the other outlets came up correctly wired. The house was built in 2008 if it matters. Thanks in advance. Attachment 49944 (http://www.doityourself.com/forum/attachments/electrical-ac-dc/49944-open-ground-series-outlets-img_20150429_163025.jpg) Attachment 49945 (http://www.doityourself.com/forum/attachments/electrical-ac-dc/49945-open-ground-series-outlets-img_20150429_163038.jpg) Attachment 49946 (http://www.doityourself.com/forum/attachments/electrical-ac-dc/49946-open-ground-series-outlets-img_20150429_163048.jpg) Attachment 49947 (http://www.doityourself.com/forum/attachments/electrical-ac-dc/49947-open-ground-series-outlets-img_20150429_163104.jpg) Attachment 49948 (http://www.doityourself.com/forum/attachments/electrical-ac-dc/49948-open-ground-series-outlets-img_20150429_163131.jpg)