Every once in a while this strange bug occurs. After all the desired products are added to the cart, on the checkout page the calculations don't make sense at all (see attached screenshot).

The tax amount and subtotal both seem to be doubled, resulting in way too high of a Grand total!

When ordering the same combination of products another time, suddenly the right calculation is used and everything seems to be working fine.

I'm using Magento and try to avoid updating to 1.8.1 during high season, so do you have any thoughts on how to fix this strange bug? No further price rules or discounts are set into place...

All support is highly appreciated!

Thanks in advance

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closed as off-topic by David Manners, Moose, Mufaddal, Marius, Fabian Blechschmidt May 20 '14 at 14:33

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Questions describing a problem that can't be reproduced OR seemingly went away on its own (or went away when a typo was fixed) are off-topic as they are unlikely to help future readers." – David Manners, Moose, Mufaddal, Marius, Fabian Blechschmidt
If this question can be reworded to fit the rules in the help center, please edit the question.

  • The first thing I would try to work out is if this is a display issue or if the incorrect numbers are in the database as well. If it is only a display issue you might be able to bypass the issue by NOT displaying the tax as part of the grand totals. – Kristof at Fooman Dec 17 '13 at 1:55
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    We've seen this before. It looks like double subtotals, but it's not. It's the subtotal of the current order and a previous cart. Check for that with customers who have the problem. If so clear your quotation order tables (sales_flat_quote and friends). – Melvyn Dec 17 '13 at 7:56
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    Does clearing the quotation order tables resolve this issue? For me it's unacceptable to repeatedly clear the tables after a customer complains, since in most cases they will be discouraged and leave the site without complaining... Perhaps it has something to do with the browser? Both instances occured in an outdated IE version. – Elemanss Dec 17 '13 at 11:59
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    This should not be closed as off-topic, no matter how hard it might be to reproduce? Melvyns answer sure helped me, even if I'm still looking to find the underlaying cause of this problem. – Christoffer Bubach Aug 26 '14 at 12:15
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    Why was this question closed? This is very real bug in Magento, it is just hard to reproduce. My experience is that most of Magento bugs are hard to reproduce, so why have this Magento stackexchange, if most of Magento bugs are not allowed to be discussed? – newbie Feb 26 '15 at 9:31