Yes, I agree. I wouldn't not purchase from you because it says 99% instead of 100%. I have always worried about this myself. I am sorry. I would agree with Luci, it is the nature of the ecommerce beast though, and try not to take it personally. We've all returns things, or have not liked something we've purchased. It's doesn't mean it wasn't a great store, shop, etc.
I do have a question on the topic though, if you receive neutral feedback does your 100% feedback change? I purchased from a store that I can't give 100% positive feedback, but I don't have the heart to give them negative, so I haven't done any feedback. I would put neutral and why if I knew it wouldn't affect their shop negatively.
Thanks, and try to move on and keep upcycling Autumn! I think your shop is great.