On a game of Jarmo I was playing against harley she did a move that did not capture one of my pieces, yet the only piece that she had captured (that I hadn't placed back on the board) was highlighted as if she did capture it.

You could maybe list another, different coloured number next to the pieces that were captured on that turn. Like beside the green frog it might say "2, 12" meaning two on this turn and 12 total. Or you could just list the images of the frogs that were captured on that turn above the number of captured frogs box - like the captured pieces on every other game are displayed...and then the number of points on that turn beside those frogs.