[Advanced] Problem in create fixture between two (or more) groups

[that\'s play soccer]

As title I have a little problem in it.

I have two group,each of them have four teams. (group1: a,b,c,d group2: e,f,g,h)

I wanna two group teams play one round. (ex. a team vs e,f,g,h team)

I found where to set. it worked. but not complete correctly.

Like this.(red square)

It should create only 4 match days. but it create 6.

In games, it won't make any team play more than 4 games. only make offset days setting couldn't match.

Anyone know how to fixed it ?

Thanks