Hi Anthony
There is a rounding issue that we are aware of that arises and shows in the totals between the way Xero calculates and Woo calculates. We do use 2 decimal places in the posting. We have increased this to 4 in the new version 2.0.5 and also added a rounding ac so that any remaining differences in the totals no matter how samll can be posted to that. We have tested it with 25 items costing £0.0621 each which is similar to your test.
Please wait for this to be released which should be in the next week or so.
Pete