I had had some Vario pages wrinkle when water was introduced to them, although now I am not sure if they were Lighthouse / Vario.
The Lighthouse Vario pages I have now have a brand mark in the lower left corner when the holes are on your left.

I have heard that there are pages out there that are sold as Lighthouse or vario but are a cheaper make so perhaps not truly Vario. Perhaps also, over the years the formulation for the pages was changed.
Do your pages have a cardboard backing or plastic? Will some water wrinkle them? Do they have the branding as shown above?
Mine do not separate at the seams of the clear and black plastic.
Do you have a tropical climate you are dealing with perhaps?