Slipstream Engine Rendering

So Im coming across a bizarre SE rendering issue. When I execute my flavor in regular Personas browser, it will show my screen and display my Group Box control (Grey area) as in Screenshot 1, When I execute it in Slipstream Engine, it seems to display the elements that are in the Group Box but without the layout format. The icons then also appear different as in screenshot 2.

However, in SE version, if I click the "Line item" button which via script, unhides a table and click it again to hide the table, it then appears with the layout and buttons as it should be as in screenshot 3. Not sure what the issue may be here?