Seems like you have multiple quests active at once that shouldn't be active at once. Also GG on passing wave 69 on the first time!
The CG thing is normal, these 2 only unlocks in the gallery, there are no trigger in the open world that triggers them.
If you didn't do the hellhound (but you probably did), you have to unlock the gallery for the hellhound boss, found at the end of the Fire Top dungeon.
The story clue you are seeing here relates to the graveyard quest. Beating the Ghost Bride miniboss there will give you the item you need.
If you happen to still have problems, I'm easily reached on our public discord :)
I'll also investigate for that story bug.