It was my impression that the Daedric forces leaking into the ruins is what gave them a twisted appearance that one could probably call "Lovecraftian". I don't think it's meant to confrom to mundane reality.
But from the dialogue itself:
When the Velothi first came to Morrowind, they worshipped their most terrible ancestors, the Daedra Lords. Legends say the Daedra Lords themselves built these great shrines, because mortals could not build anything grand enough to suit them.
It's definitely meant to look decidedly otherwordly.
They would have to *BE* otherworldly, in order for them to stand like that. Stone Masons have to worry about things like... Center of gravity, Critical pressure, wear forces, etc....
Those ruins throw 100% of that to the wind.