TOTAL control problem

[Reseaux]

Hello,

I am currently working on an online store and I have a concern when I make orders for testing.
Arrive at level 5 of my order , my total does not match.

A picture will be easier to understand.

Normally my order should reach € 40.50 and not € 38.60.

Thks

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1. 

   Capture-d’écran-2015-09-30-à-11.42.06.png
   

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