Bizarre Monster Book Error

Alright so I decided to experiment with this some. went to Elin to hunt some monsters there, and found stone bug. Now, I watched what happened.
Prior to the stone bug:

 Spoiler

After:

 Spoiler

Do you see what happened? Look at Blood Harp and Dual Ghost Pirate, Blue Kentaurus and Blue Dragon Turtle. Notice they're exactly 3 (filled in) spaces apart.

Now the patter sort of breaks down as it goes farther on, but... that's something, right?

Isaac, you may be on to something. The 3 pattern has happened in my book as well, only with a lot less cards. Here's a list of my purple, black, and special tabs:

Pre-v.72:
5 Jr. Newtie
3 Skelosaurus
5 Nest Golem
5 King Slime
5 Alishar
5 Lord Pirate
5 Papa Pixie
5 Frankenroid
5 Crimson Balrog

After Picking up a Memory Monk card:
5 Jr. Newtie
5 Memory Monk (should be 1)
5 Skelosaurus (should be 3)
5 Nest Golem
1 King Slime (should be 5)
3 Alishar (should be 5)
5 Lord Pirate
5 Papa Pixie
5 Frankenroid
5 Crimson Balrog

So it looks like the numbers of my cards have shifted to the cards that are 3 over from the proper one. And the ones at the end got filled in in the empty spaces from the shift.