Problem using Multiple Curves intersection tool (intersection events missing)

Hi All,

I am relatively new to GH and would really appreciate some help on this, thanks!

I have two sets of contours inside of a rectangle, both are diagonal : one with a 45 degree angle, the other -45 degree. What I'd like to do is get all the intersection points so I can use them as centres to create spheres later. 

However it appears the Multiple Curves intersection tool is intersecting each curve only once, rather than finding all the possible intersection (as if curve at position "n" in the first list was then being matched with curve "n" from the second list only) and I don't know how to solve this...

Thank you and have a nice day!

Thomas