@lloydz, thanks for the solution. Adding property selectionMode to ‘custom’, woked.
We have 2 grids on the page and both have a lot of data/rows, this behavior was gettings annoying. However, the after playing around, I can see it being useful to have the screen auto jump to center the table if it’s slightly off. I think a more obvious behavior would work, like a smooth scroll animation. This way its obvious to the user what the behavior is doing.