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It sounds like its normal to you, but this mode has randomized heroes and teams system, they joins to you if you're kill them, look at the top left for see your team & count of team members.
Bots supported only in Havana, Hollywood & Workshop maps, if you won't play without bots you can play on all maps.
Disable bots in workshop settings or enable bots in workshop settings if you want.
This Mode is more fun in small maps.