What's the proper way to update color of last class power bar?

[devilArt]

This is my PostUpdate code for classpower

local function PostUpdateClassPower(element, cur, max, hasMaxChanged, powerType)
    local style = element.__owner.unitStyle
    local gap = 3
    local maxWidth
 
    if style == 'player' then
        maxWidth = C.DB.unitframe.player_width
    else
        maxWidth = C.DB.nameplate.pp_width
    end
 
    if hasMaxChanged then
        for i = 1, max do
            element[i]:SetWidth((maxWidth - (max - 1) * gap) / max)
        end
 
        element[max]:SetStatusBarColor(unpack(lastBarColors[C.MyClass]))
    end
end

When I log into the game for the first time


After /reload it returns to normal


Dose anyone konw the reason?