The forgeries I mentioned are modern - one was found in a bazaar in the late 19th century, others are copies with additions which appear genuine.
Then there are legitimate lists with unknown kings, and others with known kings omitted. Kings often changed their names - sometimes a king was know by one name and later by another - worse, one of those new names might be of another king altogether.
They didn’t forge in the old days, they just omitted kings they didn’t like for whatever reason during the rein of one king, but in the next rein, the list might have the omitted kings because they had been ‘repatriated’ as their cults were resurrected by some priests in some temple.
Its extremely confusing, and if you have one opinion about the placement of a particular king and one of your colleges has a different one - it can come to blows, the temperaments being very heated, since their professional careers are at stake.
The Egyptians have definitely scrubbed their history. I’m too busy to provide examples, but I’ve read of more than merely one.
“...since their professional careers are at stake.”
Yes, since that has now trumped ‘science’.
And, might I add, a financial incentive. (thanks a lot, hawass & fauxi).