Why is my NumberValue messing up at 100 Trillion?

I am trying to make a script to go up to like Quadrillion, and Quintilian but it messes up at 100 Trillion, can anyone help me with this?

Code:

local money = script.Parent.Parent["Money"]


while wait() do

    local val = math.abs(money.Value)
    local str = tostring(val)


    -- Trillions
    if val >=1e+14 then
        script.Parent.Text = string.sub(str, 1,3).."."..string.sub(str, 4,4).."T+"
    elseif val >=1e+13 then
        script.Parent.Text = string.sub(str, 1,2).."."..string.sub(str, 3,3).."T+"
    elseif val >=1e+12 then
        script.Parent.Text = string.sub(str, 1,1).."."..string.sub(str, 2,2).."T+"
    -- Billions
    elseif val >=1e+11 then
        script.Parent.Text = string.sub(str, 1,3).."."..string.sub(str, 3,3).."B+"
    elseif val >=1e+10 then
        script.Parent.Text = string.sub(str, 1,2).."."..string.sub(str, 3,3).."B+"
    elseif val >=1e+9 then
        script.Parent.Text = string.sub(str, 1,1).."."..string.sub(str, 2,2).."B+"
    -- Millions
    elseif val >=1e+8 then
        script.Parent.Text = string.sub(str, 1,3).."."..string.sub(str, 3,3).."M+"
    elseif val >=1e+7 then
        script.Parent.Text = string.sub(str, 1,2).."."..string.sub(str, 3,3).."M+"
    elseif val >=1e+6 then
        script.Parent.Text = string.sub(str, 1,1).."."..string.sub(str, 2,2).."M+"
    -- Thousands
    elseif val >=1e+5 then
        script.Parent.Text = string.sub(str, 1,3).."."..string.sub(str, 3,3).."M+"
    elseif val >=1e+4 then
        script.Parent.Text = string.sub(str, 1,2).."."..string.sub(str, 3,3).."M+"
    elseif val >=1e+3 then
        script.Parent.Text = string.sub(str, 1,1).."."..string.sub(str, 2,2).."M+"
    -- Hundreds
    elseif val >=0 then
        script.Parent.Text = str
    end
end