I’m new to using Karamba 3D and Grasshopper in general and would appreciate your help with fixing this issue. Thank you!

How can I connect the nodes so that they remain connected during deformation?

The same thing happened here as well.

I would suggest going through some basic tutorials first, before asking a question:

Yours beam/trusses are probably not meeting in a point… (you need to subdivide your beams accordingly)

yes Rudi is correct, try to split your beams at their intersections