I'm kind of confused what you mean here, does this mean it shows 17 mins after stopping the timer? Or does your timer start at 17 minutes every time? If it starts with 17 minutes, that's not normal, and there's a setting somewhere where it asks if you want to start your timer with a value, which you probably changed by accident, I'd check that. Although it's also possible that you aren't resetting your timer, but just stopping it instead, so make sure you are actually resetting it with the proper hotkey.

It's also possible you accidentally switched to a different time comparison like best times instead of something that would reflect your personal best or previous run.