When I try pacman -Syy or pacman -Syu it says that everything is up to date despite there being packages I have that I know are not up to date. If I try to specifically update them or just reinstall them pacman just says that they are the latest version. I’ve used Manjaro for about a week now and every time I try to update it tells me everything is up to date.
I have no trouble installing things with pacman so I assume it is just failing to update the database. I’ve tried using different mirrors but I still get no luck.
It depends which branch you are on. There is a Stable-Staging Update at the moment. Stable should be soon, I would think. You can try to update your mirrors with sudo pacman-mirrors --fasttrack
To see which branch you are on take a look here: /etc/pacman.d/mirrorlist
To switch branches to testing for example: sudo pacman-mirrors --api -B testing
The announcements section here gives a terrific indication of what is going on and any issues that you may encounter. I would recommend reading regularly.