If time is still running on your watch, we can safely rule out interference from time-manipulating aliens.
Are you buying from outside of the U.S. (Canada, in particular)? Your country's customs department may decide to hold your items at the border temporarily, often without explanation, eh!
Note: Canada's customs department takes a particularly long time to resolve these holds. Don’t worry, though. This doesn’t happen a good deal of the time. But if your order has been held up, we suggest calling your country's customs department directly and ask that they release your items immediately. Or else. ;)