I don’t know if this is just me, but I’ve experienced this ever since I remember. It was present in the old interface, and I’m still seeing this in the new interface.
Whenever we hover over the Stats button on the top right, it shows the Num played, Num correct, and if it isn’t new, also the Last seen.
But if I were to proceed to the next sentence by typing in the word and hitting the Return key, the tool tip lingers, and it doesn’t disappear for the entire session.
I’m using Google Chrome if it matters.
