How do I make Member and Guest not show up?

So I'm making rank tags for the chat in my game but for some reason ranks under 248 still show up. How do I prevent this?

local Players = game:GetService("Players")
local ScriptService = game:GetService("ServerScriptService")
local ChatService = require(ScriptService:WaitForChild("ChatServiceRunner").ChatService)
local MarketplaceService = game:GetService("MarketplaceService")

local colors = {
    [255] = Color3.fromRGB(0, 255, 99);
    [254] = Color3.fromRGB(160, 56, 206);
    [253] = Color3.fromRGB(0, 255, 227);
    [252] = Color3.fromRGB(255, 98, 232);
    [251] = Color3.fromRGB(255, 63, 66);
    [250] = Color3.fromRGB(255, 103, 40);
    [249] = Color3.fromRGB(255, 179, 27);
    [248] = Color3.fromRGB(172, 172, 85)
}

ChatService.SpeakerAdded:Connect(function(SpeakerName)
    if game.Players:FindFirstChild(SpeakerName) then
        local plr = game.Players:FindFirstChild(SpeakerName)
        local UserId = plr.UserId
        local Speaker = ChatService:GetSpeaker(SpeakerName)

        if plr:GetRankInGroup(3525740) >= 248 then
            local tag = {TagText = nil, TagColor = nil}
            tag.TagText = string.upper(plr:GetRoleInGroup(3525740))
            tag.TagColor = colors[plr:GetRankInGroup(3525740)]

            Speaker:SetExtraData("Tags", {tag})
            Speaker:SetExtraData("ChatColor", Color3.fromRGB(255,215,0))
        end
    end
end)