We've had an issue with sorting large, grouped dataSources only in Chrome.
In this thread it was suggested that you have to ensure there's a sort definition on the dataSource: https://www.telerik.com/forums/server-sorting-client-grouping-messes-up-order-in-chrome
It appears to work, but only sometimes, and seems to be random when it fails. There was previously a bug filed in Chrome because it uses an unstable sort, but this issue has been closed as "Working as Intended" by the Chrome team. https://bugs.chromium.org/p/v8/issues/detail?id=90
We're using kendo controls v2017.3.913, but as the bug in Chrome was closed, is there a possibility of re-addressing this with Telerik?