just encountered a bug and wanted to let you know in case it's helpful. I had a small scrap of fabric left (~0.1m) and when I purchased one more meter, the fabric list insisted that I now had -0.9m of that fabric (yes, that's a negative symbol). I had to buy a second meter, and now it says I have 0.08m of fabric left, which means I'm going to need to buy a third meter just to be able to finish out this pattern and compensate for whatever mathematical shenanigans are happening. If this isn't helpful, feel free to ignore, and if you need more details, let me know!