Hello there, Meshe!

I know crafting can be rough on your productivity sometimes, it is for me.
Based on your description though I believe it is safe to say that this is not a bug. As your fellow player said, and as I'm sure you are aware, there is always a chance of failure and several factors that effect failure to synthesize. Please feel free to review our community sites for any additional information at Community Sites. Take care and I hope you get 100 Clothcraft soon!