Has someone problems with item counting in Destiny 2? For example, i have one empty slot, but counter thinks it filled. Also any try add item to inventory (from "Seasons" tab in director, for example) fails with reason "Inventory is full".
You probably have an Armor 2.0 Transcendent Blessing mod; you can verify that by checking the Outlaw mod slot on a piece of Armor 2.0 Reverie Dawn armor. Also, delete all the weapon mods you still have in your inventory; those became reusable with the launch of New Light, and copies no longer need to be acquired.