Fault in Games Explorer?

Using Internet Explorer, the board jumps after following moves
1. e4 Nf6 2. Nc3 d5 3. e5 d4 4. exf6 dxc3 5. fxe7 cxd2+ 6. Qxd2 Qxd2+
Using Google Chrome, the board jumps after following moves
1. e4 Nf6 2. Nc3 d5 3. e5 d4 4. exf6 dxc3 5. fxg7 cxd2+ 6. Qxd2 Qxd2+

Note, the same moves were played but ie shows 5. fxe7 (correctly) and chrome shows 5. fxg7 (incorrectly)
Both boards change the pawn from e7 to g7

YouTube

Firefox does something different again - the board shows all the correct placings and moves but in the move list the black Qxe2+ is shown as Qxd2+. So now we have three variants, all incorrect in some respect.