gub, the site you reference diverges with its #3449 and #3451 posts, which are partial stringer messages that may not have been meant for the general Q drops.
These two drops do not appear on the 2 sites I reference, which accounts for the difference in numbering of 2.
At https://8ch.net/qresearch/res/7271604.html, the three appear as Patriots Fight #473,#474 and #475.
I can’t account for why the numbering is not consistent across sites.
This has happened before and usually corrects itself in short order, but it has not happened for a very long time.
Yes, you are correct. I traced back & found the same thing. Perhaps the site I was looking at will delete & reorder the numbers.