Magento Debugging - Fix Tax Calculation

I am displaying tax for items and shipping during checkout and on invoices. Also I am displaying gross subtotal and gross shipping cost.

This for some reason is not working correctly on pdf invoice sometimes. Here, the tax amount of the shipping cost is being added to the gross subtotal amount - but it is also included in the tax itself. The grandtotal however is correct - only the gross subtotal is wrong.

Here is an example:

Correct value during checkout and in backend:

Subtotal (incl tax): 19,90

Shipping (incl tax): 4,95

Incl Tax: 3,97

Grandtotal: 24,85

Incorrect value on pdf invoice:

Subtotal (incl tax): 20,69

Shipping (incl tax): 4,95

Incl Tax: 3,97

Grandtotal: 24,85

As you can see, the subtotal is wrong. It is 0,79 more than the correct value. 0,79 beeing exactly 19% (tax) of the 4,95 shipping costs.

This issue only exists on some invoices. It doesn't seem to be related to a payment method and so far I have not been able to find the common constant.

Screenshots of all settings can be provided. Backend or DB access can be given if needed although I would prefer avoiding this.

Skills: Magento

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