Weird bumping when box is welded to player

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#1

Basically I am welding the box when the proximity prompt is triggered. The problem is that there is a weird glitching happening.

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This is the code (moduleScript, I am just requiring the script for each box.)

local module = {}


-- This script is for grabbing.
function module.AddProximityAndConnect(part)
	
	local block = part
	
	local Parent = part
	local proximityPrompt = Instance.new("ProximityPrompt")
	proximityPrompt.Parent = Parent
	local collectionService = game:GetService("CollectionService")
	proximityPrompt.RequiresLineOfSight = false	
	
	
	
	proximityPrompt.Triggered:Connect(function(player : Player)
		part:SetAttribute("CanGridLayout", false)
		
		local weld = Instance.new("Weld")
		local char = player.Character
		local torso = char:WaitForChild("UpperTorso")
		weld.Parent = block
		weld.Part0 = block
		weld.Part1 = torso
		block.CFrame = torso.CFrame
		
		
		local stackTable = workspace.BoxFolder[player.UserId].carrying:GetChildren()
		local offset = 0
		
		for i, blockIterate : BasePart in stackTable do
			local add = blockIterate.Size.Y
			offset += add
		end
			
		block.Position = block.Position + torso.CFrame.LookVector + Vector3.new(0, (offset+(block.Size.Y/2)), 0) + (block.CFrame.LookVector * block.Size.Z/2)


		weld.Name = "BlockWeld"
		block.ProximityPrompt.MaxActivationDistance = 0
		block.CanCollide = false
		block.Parent = workspace.BoxFolder[player.UserId].carrying
		block.Massless = true
		
	end)
	
	
end

return module

I am not sure why this is happening. I tried making the box massless which didn’t contribute at all. I read some post about setting rootPriority to -1 which also didn’t help.

Thanks in advance!