Billing Migration Notice: This article may not apply to you if you have not migrated yet. To see if you have been migrated, please review the article: How do I know if I am on the new billing system?
No, you are not being charged double. The negative amounts (e.g., Sales Tax, Subscription Fee, Management Fee) on your earning statement are an accounting standard used to clearly present deductions from your Gross Earnings. They are not duplicate charges.