Let's say I have a crafted weapon that is 90% towards the next level, then I complete a playlist activity. These activity completions give 25% progress, so the weapon should level up and have 15% progress towards the next level, right? Wrong. For some reason, the extra 15% progress doesn't carry over to the next level, it gets wasted. The weapon levels up and shows 0% progress towards the next level. Either this is a bug, or it's an incredibly stupid design decision from Bungie. Either way, it should be fixed.