I'm here to provide some insight regarding the sales tax disappearing off of your invoices.
We have received reports similar to this issue. Rest assured, our engineers are fully aware of this and currently working hard to investigate the cause and come up with a solution as soon as possible.
While we're working on this, I highly recommend you get in touch with our Customer Care Team. I want to ensure you're added on our affected users list, so we can notify you once the issue has been resolved.