My script is failing to delete the BasicUpgrader1B, for some reason?

The problem is most likely that the script is executing before the model has even loaded in.

We can fix this by waiting for each individual model before carrying out the function.

model1 = script.Parent.Parent.Parent:WaitForChild("BasicUpgrader1B")
model2 = script.Parent.Parent.Parent:WaitForChild("BasicUpgrader1A")
model3 = script.Parent.Parent.Parent:WaitForChild("BasicUpgrader1C")
UpgradeCost = 150

upgradeStuff1 = model1:clone()
upgradeStuff2 = model2:clone()
upgradeStuff3 = model3:clone()

wait(1)

model1:remove()
model2:remove()
model3:remove()
owner = script.Parent.Parent.Parent.OwnerName
local ting = 0

function onTouch(hit)
    if ting == 0 then
        ting = 1
        check = hit.Parent:FindFirstChild("Humanoid")
        if check ~= nil then
            if hit.Parent.Name == owner.Value then
                local user = game.Players:GetPlayerFromCharacter(hit.Parent)
                local stats = user:FindFirstChild("leaderstats")
                if stats ~= nil then
                    local cash = stats:FindFirstChild("Cash")
                    if cash.value > (UpgradeCost-1) then
                        cash.Value = cash.Value - UpgradeCost
                        upgradeStuff1.Parent = script.Parent.Parent.Parent
                        upgradeStuff2.Parent = script.Parent.Parent.Parent
                        upgradeStuff3.Parent = script.Parent.Parent.Parent
                        script.Parent.Parent:remove()
                    end
                end
            end
        end
        ting = 0
    end
end

script.Parent.Touched:connect(onTouch)