Loot roll windows do not appear in the configured 'roll' location from Dominos, but in the default bottom-centered position.
These are the frames:
I think this should be resolved now.
The LootWonAlertFrame seems anchored to the topmost GroupLootFrame; this means it's always pushed outside Dominos' Roll window. Or, in case no more GroupLootFrames are currently shown, it jumps back to the default bottom-centered position.
Furthermore, is there a way to bottom-align the loot frames (like blizz default)? So the first one is shown at the bottom of the Roll window, and any additional loot frames are stacked on top of it... I tried unchecking the "Layout buttons from Top to Bottom" option, but I don't think it has any meaning for the Roll window.