This never used to be an issue in the past with this client version, but I have noticed two things:
When dealing with quests that have multiple monster kill targets for example "Kill 30 x, y, and z monsters", the text that appears when you slay a monster only appears for one of them. Then when you kill the remaining monsters, the first one keeps appearing as 30/30. This can be reproduced by doing the 111-120 Eden group monster hunting quest for Incubus, Sucubus and Violy. I can't add any additional quest descriptions to questid2display.txt, they don't appear in the quest log. Tried increasing MAX_QUEST_DB but this didn't help.
EDIT: Was an issue with my grf editor not saving properly. Issue 1 still not resolved however.