It's normal and nothing to worry about, but it can be rather confusing! You can sometimes get different readings from the same finger taken a short time apart too. Your glucose levels will be changing as your blood circulates, so you may see these fluctuations.
Your tests are (just) a snapshot in time, and you should be looking for patterns/trends over time rather than be concerned too much about individual results. If you get a very unexpected result though, it's probably worth washing your hands (again) and retesting, but otherwise don't worry.
Robbity