This might happen with buttons too, but I havent tested
Here's the code that recreates it
local Rayfield = loadstring(game:HttpGet('https://sirius.menu/rayfield'))()
local Window = Rayfield:CreateWindow({
Name = "Test",
Theme = "Default"
})
local Tab = Window:CreateTab("Test")
Tab:CreateDropdown({
Name = "Theme",
Options = {"Default", "AmberGlow", "Amethyst", "Bloom", "DarkBlue", "Green", "Light", "Ocean", "Serenity"},
CurrentOption = {"Default"},
Flag = "ThemeDropdown",
Callback = function(option)
Window.ModifyTheme(option[1])
end
})