*edit
Ok, can you check console output with command
status
*edit edit
If your warmup ends before player(s) enter in game, those can't join in danger zone match anymore.
If you launch csgo SRCDS with launch parameter
Code:
-maxplayers_override n // n is number of players
...
maxplayers inside
gamemodes.txt or
gamemodes_server.txt is not dynamic anymore, it is then fixed size.
You either remove that
-maxplayers_override parameter or set new fixed max players size.
*edit
here example to override valve setting with gamemodes_server.txt
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