Bizarre Monster Book Error

i dont think so.

to me it looks more like by getting one of the new cards you sort of insert a new page into a book.

lets say your book is 200 pages long. if you stick in a new page at 75: everything before is unaffected, but each page after gets relabeled as a page 1 higher. the book still contains the same info, except the info shifts 1 page higher after the inserted page.
think of each page number as a certain card, and the info each page contains is how many you have.

the 2nd part: where does the last # info go when everything gets shifted forward by 1? when you pick up a new card ill bet that the next time you log in, whatever you had on Leviathan (or the highest card in your book if it isnt Leviathan) ends up on the card you last picked up. the end effect is the card you just picked up seems randomized because you dont know where its # info came from (when its really whatever you had on leviathan. or... w/e is your last card).

bombs, or anyone, try to get a new boss card. i think it wont mess up your book. (if you can :/). damn my lack of compsci knowledge.

 Spoiler

I was thinking something along the lines of this too. If look closely I think the new cards have essentially "pushed" cards down into later cards in the monsterbook.

Look again closely at my picture at the number of cards between the medals, they are same in the first picture and in the second. King Slime cards moved exactly 6 monstercards over, same for the other boss cards. But this count only goes for cards you have, it doesn't count the spaces for cards that are blank.

 my monsterbook comparison from page 1

have you picked up 4 other new-to-your-book non-tt / non-ellin cards since patch time?