https://www.gamespot.com/articles/destiny-2-players-angry-after-discovery-of-xp-rest/1100-6455202/

Bungie has found itself under fire in recent days after the discovery of a previously undisclosed XP scaling system in Destiny 2, which constrained XP gain in some situations. The studio has since acknowledged its existence and at least temporarily disabled it, but this has coincided with an increase to the amount of XP needed to level up, further frustrating some players.