Today (11th July), Bandai Namco launched patch v1.03 for Dark Souls Remastered across all platforms aimed at fixing a variety of bugs. There will also be server maintenance throughout the day.
Some of the main bugs that are now resolved involve bosses such as The Four Kings and Lord of Cinder, display of Estus Flask possession, and various tweaks to multiplayer. On Xbox, specifically, the v1.03 resolves an issue where after resetting a characters stats and creating a new character, the new character will display the reset stats.
A full list of patches for each platform can be found on a post by VG247.
Server maintenance was scheduled to take place on Xbox One between 01:00 and 07:00 UTC, meaning that everything should now be up and running.