I posted this some time ago in "Help & Support" but there was no helpful reply, and the bug is still present.  So there:

Hi, when I enter these moves into the explorer:

1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.O-O a6 7.Bb3 b5 8.a4 Bb7 9.axb5 axb5

it says there are 20 games with that position, all continuing 10. Rxa8.  But when I actually add 10. Rxa8 on the board, suddenly there are only 5 games with the new position!  Logic demands something has got to give

Presumably in the other 15 games, Black did something other than Bxa8 - something so crazy, that Game Explorer can't bring itself to list those games.