The installed and enabled order total module(s) calculate tax (not Edit Orders). Let me repeat, Edit Orders does not calculate the order totals (such as subtotal, coupons, discounts, tax, or total). Edit Orders does load and run the installed and enabled order total modules against every order (same as the stock Zen Cart customer checkout process). The order total amounts are calculated by the installed order total modules (if there is an editable text input field they will be overridden by the contents of the field - which can cause some tax related errors for modules "recalculating tax" if they are changed and the order total module is ignorant of the value saved in the database).
Not all order total modules play well when loaded and run from the Zen Cart administrative interface. I see you have multiple non-stock Zen Cart order total modules installed. Are you using the latest versions of all order total modules (and ones compatible with Zen Cart 1.5.3)? What are the exact versions of the installed order total modules (include link and version numbers)? Which order total modules are being used on the order where problems are experienced? Was anything "edited" in the order (and what was edited)?
In order to help us better help you, we will need to know how to duplicate the issue. I have a better idea after your last post, but more specifics would be good (including store, customer, order total module, tax, and other related information and settings). When answering please use code tags to wrap long answers (such as settings and file contents). These can be added by clicking the "#" when replying (should look like: [CODE]long list of settings or contents of a file[/CODE]).
You may wish to enable the "debug log" at "TOTALS". These logs may give us some additional insight as to where things may be getting off track.
Note: As time permits, I try to provide help for reported issues when able to duplicate the issue in a stock Zen Cart installation. This is basically "volunteer" time (my day job takes precedence), so please be patient as it may take awhile before an answer is posted. Just a note for anyone reading this post, I no longer provide troubleshooting services for free against heavily modified Zen Cart installations or databases.
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