Hi! I noticed that a few of the advancements in Alex's Mobs and Alex's Caves share the same UUID. I have never encountered an issue like this before, but I've made a modpack that includes Hardcore Questing Mode. Depending on the advancement (as some do not have this issue) when you make a quest that relies on an advancement being complete (which all the quest in my pack are) then once that advancement is complete it counts both quest in the quest book as complete.

The ones I've found so far are:

Once Upon a Cave + Hand In Glove

Lorem Ipsum + Blindsided

Town Of Bedrock + Farland Security

It's totally possible this is a HQM issue, but I am unsure so I wanted to bring it to your attention.

Thank you for all the wonderful mods you provide for us :)

It was a HQM issue!