So when trying to update the settings of the page I moderate I get this error: Base game cannot be this game.

Has anyone else had this before and resolved it? (I've submitted a ticket for now too but any help would be greatly appreciated)!

The base game is what links games with certain game types to each other. For example, a category extension should have a base game of its normal game. Or a Fangame should have a base game of its game that it's a fan of.

Your game has a pre release game type, with its base game being itself.

So your game is a pre release of itself

This can be seen by the base game link in the game page linking to itself.