When I'm logged into Xively, it shows the correct timestamps for my feed. When I'm not logged in, it shows an incorrect timestamp. For the record, this is a dust sensor connected to an Arduino Ethernet. The Arduino doesn't set the timestamp itself (it relies on Xively for that).
Am I doing something wrong to cause this unexpected behavior? Or is this a Xively bug?
Correct timestamp is shown when I'm logged in: 
Incorrect timestamp is shown when I'm NOT logged in - I think it defaults to UTC 