The UI for the gear is legitimately pretty messy. The store specifically is a hot mess, anything you buy is being compared to what you have INCLUDING the sockets, which makes it so basically everything looks "worse" and the only workaround is removing all the sockets first. There's way too many types of materials for crafting, and random stuff you pick up that are permanent buffs that are clunky to locate what it was you just picked up.
There's also the final upgrade for your weapon, which is optional but easy to miss. You get a special material that you have to trade in the store in a different tab to then apply the upgrade to the weapon. It doesn't lead you through that well whatsoever.