Too, if you just try nf3, you'll see 1...nf6 answer has only 94.226 games, but if you click on it there's a sum of around 200.000 games after
There's an error in game explorer data?

It works. The interior sum is always greater cuz of additional games arising as transpositions from other openings.
Reti Opening, master database, number of played games with some moves doesn't work... for example try nf3, nf6, then you see 2.d4 has 103.418 games... but when you enter you can clearly see the sum doesn't work, if you sum the other moves number of games it results much more than 103.418 games
Sorry, my english isn't very good, but I hope you understood what I say