Turn off your grid snap. Turn on Osnap (End, Near, Perp) . Type Learn in the command line (Yes, Rhino has a built-in tutorial). And never, ever use Explode on a curve you intend to extrude.
🟨 Section 3: Intermediate Phase – Freeform Surface Creation Rhino 3d - Any Version - Beginner Level To Advanced Level
Transition from simple shapes to complex, editable geometries. Turn off your grid snap
This separates pros from amateurs.