I can go through walls in a model even if im not supposed to?

Hello im making a hotdog stand for a script builder and it happens that every 2 or 3 seconds i can go through the walls and everything, there are no errors, i tried using .Changed but the can collide property doesn't change even if i can go through the walls, what am i doing wrong?

local owner = game:GetService("Players")["maumaumaumaumaumau"]
owner.Character.Torso.CFrame = CFrame.new(Stand.MainStand.VehicleSeat.Position)
script.Parent = owner.Character

function FullAnchor()
        for i,v in pairs(Stand:GetDescendants()) do  if v.ClassName ~= "Script" and v.ClassName ~= "Model" and v.ClassName ~= "Weld" and v.ClassName ~= "SpecialMesh" and v.ClassName ~= "Sound"  and v.ClassName ~= "DistortionSoundEffect" then 
        v.Anchored = true 
    end
        end
        end
function FullHide()
        for i,v in pairs(Stand.big:GetDescendants()) do  if v.ClassName ~= "Script" and v.ClassName ~= "Model" and v.ClassName ~= "Weld" and v.ClassName ~= "SpecialMesh" and v.ClassName ~= "Sound"  and v.ClassName ~= "DistortionSoundEffect" then 
        v.Transparency = 1

        v.CanCollide = false
        if v:IsA("VehicleSeat") or v:IsA("Seat") then
            v.Disabled = true
        end

    end
        end
        end
function ToggleBig()
    for i,v in pairs(Stand.big:GetDescendants()) do  if v.ClassName ~= "Script" and v.ClassName ~= "Model" and v.ClassName ~= "Weld" and v.ClassName ~= "SpecialMesh" and v.ClassName ~= "Sound"  and v.ClassName ~= "DistortionSoundEffect" then 
        if v.Transparency == 0 then
        v.Transparency = 1 
        elseif v.Transparency == 1 then
            v.Transparency = 0
        end
        if v.Name == "glass" then
            v.Transparency = 0.5
        end
        v.CanCollide = not v.CanCollide 
        if v:IsA("VehicleSeat") or v:IsA("Seat") then
            v.Disabled = not v.Disabled
        end 
    end
    end
    end
FullHide()
FullAnchor()
function Clone(Child,parent)
    if not parent then
    return Child:Clone()
    else
        local ClonedChild = Child:Clone()
        ClonedChild.Parent = parent
        return ClonedChild
    end
end

owner.Chatted:Connect(function(m)
    if m:lower() == ("toggle/") then
        ToggleBig()
    end
end)