I have hunted Qualified Knitting Ball from pigs and tried to use on the sock after opening up the UI. It says "You have used the qualified knitting ball on the socks", but the knitting ball quantity remains the same no matter how much I tried to drop into the UI. This bug actually made me unable to leave any map via portal. I have to change channel to enter portal again.
I'm not sure what might be causing this. Can you let me know your character name, and if possible which channel you were on when this issue occurred? This will help me to try and find a possible error message in our logs.
I was just about to post this. This is a common problem with the feeding UI. Happened in Easter, and happens with that Ludibrium quest where you feed the bird.
I've used 5 and no change so far. I've also closed and opened the sock window. I hope something will change on the 10th one, will update soon.