Why does the following code initially print an incorrect output?

[seyan777]

Hi,

I wrote the following codes to check the amount of completed artifact for each races.

local b = CreateFrame("Button", nil, UIParent, "OptionsButtonTemplate")
b:RegisterEvent("PLAYER_LOGIN")
b:SetPoint("TOP", 0, -100)
b:SetText(GetArchaeologyInfo())
b:SetScript("OnEvent", function(self, event, ...)
    if event == "PLAYER_LOGIN" then
        self:UnregisterEvent("PLAYER_LOGIN")
 
        if not IsAddOnLoaded("Blizzard_ArchaeologyUI") then
            LoadAddOn("Blizzard_ArchaeologyUI")
        end
    end
end);
b:SetScript("OnClick", function()
    ArchaeologyFrameCompletedButton:Click()
 
    local totalCompletion = 0
 
    for i = 1, GetNumArchaeologyRaces() do
        local j = GetNumArtifactsByRace(i)
 
        local raceName = GetArchaeologyRaceInfo(i)
 
        local currentCompletion = 0
 
        for k = 1, j do
            local _, _, _, _, _, _, _, _, completionCount = GetArtifactInfoByRace(i, k)
 
            currentCompletion = currentCompletion + completionCount
        end
 
        totalCompletion = totalCompletion + currentCompletion
 
        if j > 1 then
            print(string.format("\124cffffff00%s:\124r %d", raceName, currentCompletion))
        end
    end
 
    print("======================")
    print(string.format("\124cffffff00Total:\124r %d", totalCompletion))
end)

The problem is that it prints an incorrect data on its initial click, then if I click the button again, it starts to print a correct amount.

I don't get where I'm doing it wrong

edit: Same behavior occurs after pressing solve button