When grouping by 2 fields, the group summary is placed every 50 lines, depending on the page size. In scolling mode 'infinite' this shouldn't happen, as it can be in the anywheren in the page. Grouping by 1 field places group summary correctly.
I've created a plunker that illustrates the issue: https://plnkr.co/edit/P5QhrugghQANBjzTHRv3?p=preview
Thanks a lot
Hi Aurelio,
Thank you for your project. I see the issue on my side. We will research this behavior. Stay tuned to our updates in this thread.