Mouse Cursor targeting being weird

[iiCant_Read (Naoto)]

This is the main code for my mouse targeting system.

effects.GetCursor = function(plr, radius)

	local mousePos = game.ReplicatedStorage.MiscRemoteEvents.getCursor:InvokeClient(plr)
	
	local part = Instance.new("Part", game.Workspace)
	part.Position = mousePos
	part.Anchored = true
	part.CanCollide = false

	-- If we were given a radius, do some trig and vector math
	if radius then

		-- Find maximum distance in the direction of the mouse
		local aimVector = mousePos - plr.Character.HumanoidRootPart.Position
		aimVector = aimVector.Unit
		aimVector *= radius

		-- If the mouse was aimed further, return this position instead
		if aimVector.Magnitude < mousePos.Magnitude then
			print("too far")
			return plr.Character.HumanoidRootPart.Position + aimVector
		end

	end

	return mousePos

end

All the remote event does is return player:GetMouse().Position.
It works. I’ve used it on a separate move, and it works.
However, when I use it on this move in particular, it works sometimes, but other times…

You can see that the part is created at my mouse. The code is supposed to create the explosion the farthest it can from the player (the given radius parameter) in that direction. Clearly, as we can see from where the part is placed, the target is not out of range.
Why is it doing this? How do I fix it?

[iiCant_Read (Naoto)]

@iiCant_Read

if aimVector.Magnitude < mousePos.Magnitude then

I needed to check against mousePos - humanoidrootpart position’s magnitude, not just mousepos’s