Bid response & Lazy loading

[Zikyi]

According to [individual ad unit refresh] (http://prebid.org/dev-docs/examples/adunit-refresh.html), suppose that we have 6 ad units on page.
All of them are loaded through RefreshBid function apart from each other.
3 of them are loaded on page load; the remnant are lazy loaded.
On page analysis HB Expert is always throwing a warning, complaining that the page is under monetized; but as the bids are concurrent, it seems to me that the time bars (blue and orange) are cumulative and do not keep track of separate auctions.
This hypothesis seems to be confirmed when the lazy loaded units are loaded (screenshot).
So, my question is: in this particular case is HB Expert analysis reliable?