Hi Thomas,
We are having the same problem with the totals not matching on some orders. We have downgraded to v 1.x and it is working without error. There may be other issues happening now, so we would like to get a patch and used the 2.x version ASAP. Here is a screenshot of the tax settings:
https://prntscr.com/oz9k13
Please email direct for more information from the site.
Thank you,
Jason