i have a problem. i have 2 dwarven broadswords, each flawless. but they are appearing in the favorites as 2 different items. i can't get both as a weapon unless i equip through my inventory. and sometimes one appears with a diamond beside it, the other not. whats going on?

I'm not sure, I think the game just doesn't know what to do with 2 identical items. I have the exact same issue with my daggers, and have had to learn to just deal with it. Sorry I couldn't give you an answer, but you aren't the only one.

The Swords do not have identical stats. Your Smithing Skill increased when tempering the Swords, and the last sword is better than the first.

When I play a Dual Wielder, I use Vanilla Weapons because of this problem.