When spot checking keyword rankings, the physical location where the search is conducted almost always biases the results.
There is a misconception that using “incognito” or “private” mode in your browser eliminates this bias. That is simply not true. Searching privately will prevent the browser from storing session data and most types of cookies, but has no impact on location bias.
This link takes you to a great tool for checking rankings by location. You can also compare results by device. You can also choose not to enter a search location.