The Explorers map won't work for me. When I use it in explore, the map does not show the last enemy I have to defeat. I have one more enemy to defeat to unlock a new level, but I can't find it anywhere and since the map is not working, I can't defeat the last enemy. Please help, I have been searching everywhere.

You have to restart the level. This means that the level glitched and you dont have another predator, nor tile. Click, "restart highest level".