I have a grid with many items with the item text is of varying lengths. I am not sure if relevant, but they are all hyperlinks.
If I scroll towards the bottom of the grid and try to edit a Tag value by hitting the space bar, the whole grid scrolls up a few lines and the bullet labels disappear.
If I next click outside the grid, the bullets reappear. If I next click on the Tag field again, the Grid scrolls down.

If I make the text column wider so that most items do not wrap the text anymore, the jumping stops (but the bullets still disappear/reappear)