Hi Costin, firstly thank you so much for downloading and using our plugin and thank you for the detailed support query and the screenshots, it really helps us when trying to resolve issues. We have reviewed and we think the problem is that there are similar settings which may be causing confusion. We have the Set “includes tax” modifier edit mode option which sets the way the price can be edited, either per unit, or in your case, for the total cost of units. This is strictly for when switching to edit mode.
Then we have the Show “includes tax” modifier cost column and Show “includes tax” modifier total column settings which are for when you are viewing the items and are not in edit mode. These add the incl. columns to the item table. Usually these settings work together in that if you show the Cost column, you would normally set the edit mode to Single item and if you show the Total column, you would normally set the edit mode to Item total and the edit box then appears in the corresponding column. When you show both columns, then the edit box will show in the column that matches its setting.
In your case however, you have only activated the Cost column, but set the edit mode to Item total and so the edit box is for the total but there is no Total column but we have to show the box somewhere so it is appearing in the Cost column and I believe this is where the confusion is coming from because it is showing the right total for editing but when done editing it is switching back to Cost mode for viewing. The screenshots below also show this in more detail, each has the settings, the view and the edit mode for that configuration:
Cost column + Single Item Edit
https://ibb.co/q9txj4r
Cost column + Item total Edit (your configuration)
https://imgbb.com/PTf0yvb
Total Column + Item total Edit (recommended setup)
https://imgbb.com/qDhG8ZJ
However, while testing we picked up an issue in the plugin where the Show “includes tax” modifier total column setting does not save properly. We have found and fixed the problem and are releasing a fix as I type this, so look out for the update so that you can adjust the configuration.
Let me know if the above answers your query or if we have missed anything and thank you again for posting as this has also helped us find the other bug I mentioned above!