Error in my international rules

[Ski120]

I've been trying to create a massive U18 tournament, 512 teams, 2 group stages each with 256 teams. 16 groups of 16 teams with 4 teams moving on to the knockout in total 64 teams qualify from each group stage meaning it will have a 128 team knockout round. However every time I go to test rules it says "Number of Teams (383) should be divisible by number of groups (16) for Preliminary Round" I didn't set the teams to 383 so I don't know how it got that or how I can fix it.

If you know how I should proceed any tips help.

Thanks