Parts being welded to certain players causing them to glitch

[NinjoOnline]

Server side script

-- Fired when Humanoid is swimming
function TailService:EquipTail(player, newState, character)
	local User = PlayerData[player.UserId]
	if not User then return end
	
	local Tail = Tails:FindFirstChild(User.Tail)
	if newState == Enum.HumanoidStateType.Swimming then
		character.LeftFoot.Transparency = 1
		character.RightFoot.Transparency = 1
		character.RightUpperLeg.Transparency = 1
		character.RightLowerLeg.Transparency = 1
		character.LeftUpperLeg.Transparency = 1
		character.LeftLowerLeg.Transparency = 1
		
		if not character:FindFirstChild('Tail') then
			local Clone = Tail:Clone()
			Clone.Name = 'Tail'
			
			local Weld = Instance.new('Weld')
			Weld.Name = 'Weld'
			Weld.Part0 = character.LowerTorso
			Weld.Part1 = Clone.PrimaryPart
			Weld.C0 = CFrame.new(0, 0, 0) * CFrame.Angles(math.rad(180), 0, 0)
			Weld.Parent = Clone
			
			Clone:SetPrimaryPartCFrame(character.HumanoidRootPart.CFrame)
			
			Clone.Parent = character
			
			Clone.PrimaryPart:SetNetworkOwner(player)
		end
	else
		if character:FindFirstChild('Tail') then
			character.LeftFoot.Transparency = 0
			character.RightFoot.Transparency = 0
			character.RightUpperLeg.Transparency = 0
			character.RightLowerLeg.Transparency = 0
			character.LeftUpperLeg.Transparency = 0
			character.LeftLowerLeg.Transparency = 0
			
			character.Tail:Destroy()
		end
	end
end

This works well for me, but for literally every other player is glitches out. I got no clue why something would work well for just me and me only.

The tail is a model. None of its parts are Anchored and are all CanCollide false. Tail works on my player (can see in video) but on other players it just glitches them out, doesn’t show up, etc.

[PeZsmistic]

Have you tried setting Massless on the tail part(s)?

[NinjoOnline]

To true???

[Quoteory]

set massless to true for all of the tail parts, if that doesn’t work you can also try setting the tail parts to cancollide false