Printing quality is low

I ordered from sticker mule multiple times. Their stickers are in general great. However my latest order with this acrylic magnet is a miss. The printing resolution is poor and thus they have mixture of different colors in my pure blue. I’m not sure if it’s because of file resolution but if that’s the case they should at least warn me before printing those hundreds of items. I probably won’t order this item anymore, hope they can do better in the future