Thanks, I'll investigate and see what's going on!
Somewhat related, I did get multiple copies of "How to fish" and Kazuma dumped it after reading the second time. Not sure if "multiple copies of book" was because it was on same round or not, or if it's just possible to get more than one book of it. Also not sure what to make of "dumping it before learning everything", was it because I had already caught a fish?
Given you can get YunYun to go on guild quests now, I'm waiting for Megumin and YunYun both being on a guild quest and bickering (in their own special way) the whole quest!