On the course page the "Group" link only links to one group even if there are two batches.
https://www.dropbox.com/s/wiriaf5tem30er4/Screen%20Shot%202019-08-21%20at%2016.15.06.png?dl=0
Hi,
Basically batches are extended form of group.
It looks like you have set course group fron edit course > components settings.
Here you can set your course group : http://prntscr.com/ovxvd9