Hi @bernoussi.sammy, this is a common problem between different versions of Grasshopper or even different computers, as the tolerances or other factors may change the order of your lists. You must create a geometrical or mathematical check when you want to take geometry from a list output which order you dont control. This is explained in the “Optimizing Grasshopper Definitions Explained!” blog post in the second case.
We also talked about this in the first day of our webinar so I invite you to attend the other two days (Today 7th of May and tomorrow 8th of May) where you will be able to learn more principles about creating cloud applications with Grasshopper. You can register here.