If your server is changing to 70 slot counts from whatever your allocated slot count is, there is a formatting issue somewhere in your command line or missing mod content.
Please review your command line with the following in mind:
- The improper spelling of a map's name; it is common for a user to enter a space between "The" and "Island". The proper format is simply "TheIsland".
Another common cause of this issue is the deletion or missing of content. I.e deleting your default-included mod content from the ShooterGame/Content/Mods directory will prevent you from loading maps like Scorched Earth, Aberration and Ragnarok. If you have deleted these files, you will need to validate your server files to re-obtain them.