Guild Wars 2

I crafted 4 level 80 masterwork rings and threw them into the forge, it tells me there is a match. I hit forge button but nothing appears and I just lost all 4 rings. I tried with another 4 masterwork items (I don’t know why, I placed 3 accessories and it grey out an amulet that I intended to put it but let me add a chest piece or an weapon, seems strange) and this time it gave me a masterwork chest piece. I wonder where the result of the first forge gone. Is there possibility that I got nothing even it tells me there is a match?

There’s always a small chance the mystic forge will give you nothing, or items of a lower rarity (for example, sometimes 4 exotics can give 1 rare). I find that forging accessories has the highest chance of giving nothing, so you’re probably better off not putting accessories in the mystic forge.