WPF DataGrid scrolling with down arrow key acts strangely?

Ok... I reproduced the behavior with strings (simple list of strings bound to the data grid). The behavior started happening when I introduced duplicates strings in my list. It seems that the data grid gets confused between the "selected index" and the "selected value".

The same kind of thing happens when I try to select a value (a string, in my test) that is present on another visible row: the selection gets screwed up: half of the time, the correct row is not selected.

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