The "Spot On" Achievement counts the total number of 5ks you have achieved. I've been trying to reach 1000 5ks for this achievement, but I noticed something strange happen. In the last two days or so I've been playing games on "A Pinpointable World" by Sverre, and I got to 898 5ks. Just now, I played another game and got 2 more 5ks so that should have put me at 900 5ks. But when I went to check the counter, it now says I have 860 5ks, 40 fewer than what I should have. Why did this happen?