DrawRope | Draws a realistically sagging rope in Unity | Game Engine library

Could you share a screenshot of your object hierarchy?

It looks like your SelectWeapon method iterates through child 'weapon' Transforms, so I'm guessing your weapon objects are children of the object with the WeaponSwitching script attached... is the Grappling Gun script attached to one of these child weapon gameobjects, or is it attached to the parent? If it's attached to the parent then the weapon switching isn't turning it off.

In either case, you could have your WeaponSwitching script(s) run the StopGrapple method in your GrapplingGun script when switching weapons, which I think should do the trick? Something like this:

The underlying issue is your raycast. the second parameter is the direction of the ray, which you have as the camera direction. Currently your ray is pointing forward from the camera at all times as a result.

What you can do is use Camera.ScreenPointToRay to give a ray to cast along to give you a 3d mouse position to cast to, then use your current raycast but replace the second parameter with the direction from the player to the point hit by the raycast from the function mentioned before