Crazy deductions from sales-

I’m a new seller and only have one product that I created.. Had a bunch of sales earlier this month.. Then after all of Amazon’s taxes and coupon redemption fees etc. and Advertizing ended up with Zero . Seems like their way of describing stuff is tricky. For example I selected “coupon does not stack” but they still double charged me discounts such as prime discount in addition to coupon discount .. Then I had some international listing. They didn’t tell me they were going to charge me a subscription fee but then it shows up. In addition to all the other fees. Seems like their system is so confusing purposefully… It’s like a shell game