If I look left or right there are strange lines at the left and right edges of the window - upper left corner on the picture. This happens just with Carenado Caravan.

If this happens only with this particular aircraft, I would say there is something wrong with the glass texture of the windoow. But I´m not a specialist in repainting, so it´s just a guess.

It happens with all Carenado Grand Caravans and Cargomaster.

It happens with all Carenado Grand Caravans and Cargomaster.

Well, I don´t have any of these planes. But It seems to me like an issue of the Alpha channel of the respective glass textures. I don´t know how to fix this. Maybe someone else can help you in this case.