Could you possibly let us know if you’re using the new beta version of Speed Review so we can track this down for you? You can tell by looking at your user settings (Log in to your account<!-- --> - Memrise) or, probably easier, just let us know if the screen you’re seeing is this one:
Got it! We do indeed have a bug here and we have it scheduled within the next couple of weeks on the new sessions.
The new designs are currently in beta, so if time spent is a feature that is important to you, you can always switch back to the old version of the site in your users settings. You can also follow along with beta progress here: Memrise Labs - Memrise