Why isn't part with BodyPosition working correctly?

I am trying to create a moving platform, and when I run the script, it wont go to the start part. The moving part will fly away diagonally and upwards.

Here is the order of parts inside the model. And the code.

local model = game.Workspace.Platform
local move = model.move
local start = model.Start
local finish = model.Finish
local bodypos = model.BodyPosition

bodypos = start.Position