Expandable Grid Issue : Grid not rendering properly

When I expand the subgrid the rows in the parent grid below it are not rendering properly

Also when i scroll to right end in the parent grid while keeping subgrid expanded the columns alignment is distorting

I think the issue is when width of main grid crosses particular limit after that when you expand subgrid the rows are not rendered properly in main grid.

Below is the plunker to replicate the issue

http://plnkr.co/edit/ir11ft0EawmSQDzaV5un?p=preview