[Resike]

I see what are you saying now, what happens if you create your unitbutton like this then?

self.headers[i]:SetAttribute("style-width", 68)
self.headers[i]:SetAttribute("style-height", 41)
self.headers[i]:SetAttribute("style-scale", 1)
 
self.headers[i]:SetAttribute("initialConfigFunction", [[
    local header = self:GetParent()
 
    self:SetHeight(header:GetAttribute("style-height") * header:GetAttribute("style-scale"))
    self:SetWidth(header:GetAttribute("style-width") * header:GetAttribute("style-scale"))
    --self:SetScale(header:GetAttribute("style-scale"))
 
    header:CallMethod("initialConfigFunction", self:GetName())
]])

No scale attribute or 1, just setting the width/height multiplied with the scale itself.

Edit:
I think the style-scale attribute is broken too, if you use a simple SetScale on the header that should also get applied on every unit child which will also scale up the unit button's width/height and the offsets will work properly too:

self.headers[i]:SetScale(1)