Why are my parts going off course during a tween?

I am currently making a boat that you can ride using tweenservice. The seats on the boat are going off course during the tween. If you want I can send you a link to a gif of it. Here is the code if it helps.

local tweeninfo = TweenInfo.new(
	10,
	Enum.EasingStyle.Linear,
	Enum.EasingDirection.Out,
	0,
	false,
	0
)

local boatgoals = 
	{
		Position = Vector3.new(-463.559, -12.501, 427.098)
	}

local seat2goals = 
	{
		Position = Vector3.new(-460.384, -11.936, 423.088)
	}

local seatgoals = 
	{
		Position = Vector3.new(-463.726, -12.053, 427.403)
	}



local boattotreestween = tweenservice:Create(boat,tweeninfo,boatgoals)
local seattweentotrees = tweenservice:Create(seat,tweeninfo,seatgoals)
local seattwototrees = tweenservice:Create(seat2,tweeninfo,seat2goals)


wait(25)
boat.Orientation = Vector3.new(0, -38.37, 0)
seat.Orientation = Vector3.new(0, 141.63, 0)
seat2.Orientation = Vector3.new(0, -38.37, 0)
boattotreestween:Play()
seattweentotrees:Play()
seattwototrees:Play()
wait(10)
boat.Orientation = Vector3.new(0, -38.37, 0)
seat.Orientation = Vector3.new(0, 141.63, 0)
seat2.Orientation = Vector3.new(0, -38.37, 0)

Thanks in advance, Cozmo.

Make sure that the boat is anchored. Otherwise not sure