Why am I being charged tax when I ship to a state where my tax exemption certificate is not issued from?

Sales tax is based on the address you are shipping to and in order to better understand your state’s tax laws or obtain exemption certificate forms please go here: https://www.salestaxhandbook.com/exemption-certificates

Every state has different requirements, exemption certificate forms and validity periods. The exemption will apply to the state where the goods are shipped to. The certificate must be on a form approved by the state.