I tested this with nothing but Forge 36.2.0 and Titles 3.3.0 installed both in single player and on a dedicated server. Having done the server test first, I discovered that titles didn't unlock at all in my GUI until I went and unlocked any titles in a single player world too; after that, logging onto the server again actually allowed me to select the advancements that I'd previously unlocked(but didn't show up in the GUI).

In single player, the mod works as expected 100% - advancements and title scrolls acquired from villagers give the player titles they can use from the Titles GUI. But on a dedicated server, titles that should have been unlocked from either advancements or scrolls don't show up in the Titles GUI until you've logged into a single player world with any titles acquired at least once.

I tested this with the Spelunker and the Pincushion titles, and by using a Common Title Scroll to acquire those handfuls of titles.

Thank you for posting this. It is a issue I am aware (it is some kind of desync problem), but I am still struggling to locate the cause. I am however currently working on it.

Definitely happens on a dedicated server... and like Febilian said the Titles show up after first logging into a Singleplayer world, which isn't very practical on big modded instances unfortunately.

This issue might be related by type to another issue, which the mod epic fights currently has

Fixed with 3.3.2