Actually, there is one case where similar behavior can be reproduced - when you scroll down so that the whole data form is not in the view port (as you described in your other ticket on the same topic - 693371). However, in this case it would be expected since each row that has gone out of the view port and is recycled by the grid (as every other virtualized control would do). Consequently, when you scroll back to that row, its parts - cells, borders, row details elements are recreated. And as the default behavior of RadDataForm is to be in read-only mode, you see it that way.
the Telerik team