For player 2 I've made two groups, group 1 has 12 starting dots and group 2 has 5... I put 12 zombies in group 1 and 5 in group 2, but only group 1 shows up and only with 5 zombies. I'm using zombies (1) for group 1... what am I doing wrong?
Could you be using the wrong spawn points? Player 2 group 1 is blue with one dot inside. A screenshot showing the spawn points would help; uploading the whole .scn file would be even better.