https://wccftech.com/returnal-3-03-update-rebalances-tower-of-sisyphus-difficulty/

A new Returnal update has gone live today worldwide, introducing some changes to the Tower of Sisyphus Endless Mode and more.

The 3.03 update rebalances the difficulty of the Tower of Sisyphus and, as a result, the leaderboards for the Endless Mode have been reset. It's not yet clear how difficulty has been rebalanced, and the official update notes do not provide any additional information on the matter.