I was cleaning up my stash and vendoring in the Echo of a World. I took 3 rare bows and had 9 available runes to use.
I inserted a bow into the forge, clicked the rune, nothing happened. Clicked again, nothing happened. The bow didn’t convert to a unique each time. Each time a rune was used.
I tried this a total of 6 times on 3 rare bow bases. I placed the rare bows in stash planning to use them later. I tried to open an echo and was stuck on the loading screen much longer than usual and Alt+F4 the game.
Loaded back in and the runes were still gone (6 runes used) and checked my stash to find that the rare bows indeed were converted to a unique. The forge didn’t display this and caused extra rune consumption.
No idea if this was some kind of desync with client/server and I’m also in the CoF faction if that may contribute to the bug. Thanks!