First : I've bug reported it too.
I noticed that on TRing, when you reach the level where the tomes are applied ( 3 for +1 for example ) the tome is applied in the calculation ( for example for skill points if it's an INT Tome ) but it does not appears on your character sheet until you have finished the leveling process.
While not really a nuisance ( as things like skill points receive the tome benefit ) it can be confusing.
I spent several minutes looking for the skill I missed at LVL 3 because of that +1 INT Tome that didn't show on character sheet.
PS: Many thanks to Kookie to have made it possible for us Europeans to participate in Dev Events.