Hi Yoohooos.

We have to tell GH how we want data be managed, In order to work correctly.

In this case, both inputs has to be in same branches to do a correct loft (both need to be flatten, with no groups), thus GH will identify those inputs and work with them 1 to 1.

I guess Judyta add a Flatten component in order to be on the safe side and remember us just no branches are needed in that case (even if inputs are already flatten).

I attach a variation where a additional flatten component will be necessary.

For diving deeper into branch structure logic inside GH, there is another Think parametric course on this topic:

https://thinkparametric.com/courses/grasshopper-102-data-lists-and-tree-structures

Cheers