The highlighted 0V-shape in the figure below fails to update itself. It rounds the corner so that the shape creeps in to the Route Keep Out area of the component.
When manually updating the shape it successfully clears the Keep Out area, but as soon as I edit the design at another place, which updates the shape I get the above behavior.
I'm using Allegro 17.2-2016 S059 [9/10/2019] Windows SPB 64-bit Edition.
Check under Shape - Global Dynamic Params that Dynamic Fill is set to Smooth which may help. I would also get up to date to the latest hotfix S066 when you get chance.