The easiest steps to reproduce this behaviour is
1. Go to demo page
https://demos.telerik.com/kendo-ui/grid/server-grouppaging-virtualization and click to Edit in Dojo. It o
Then, to get rid of narrow groups I will change grouping from
and also adjust pageSize to 10:
2. Now, when I Run example, open Chrome Debug tools to Network traffic and expand Shady shores, I get records starting with:
I can see first request starting wtih Page:1
3. Now I scroll the virtual view just a bit down to get another 10 records. Surprisingly, I get same records again.
We need to resolve this bug, because we can not use grid without this features (virtual scrolling and grouping).