As discussed with Martin in support ticket 1429284, some of the column values in my grid might be the same, but with different letter cases. For example, column "First Name" could have the values "Elias", "elias", and "ELIAS".
When grouping, Kendo grid grouping treats those values as 3 separate groups because its case sensitive. Our users expect those values to be grouped as 1 to avoid confusion.
The workaround provided might affect other dependent features and make the code a bit messy.
I would appreciate it if you could add in a future version, a built in option to ignore case when grouping without changing the original displayed values.