This is actually like a forced fix to a glaring issue. I am sure many people must have noticed this and instead of complaining about it must have decided to move to
another software like prestashop or something. Its like asking your visitors give a negative message that there are discrepencies... move to another site.
Should be modified.
Instead of the price difference being displayed, the software can calculate the final price in the background and display the modified price.
Logic should prevail, not the issue of liking or not liking by the programmer.
The naive visitor doesnt know calculations, and if the - before the price is a hyphen or a minus sign.
When the visitor is going to click on buy, there shoyld be no distractions. All in good taste