Wrong amount for item in Quote and Order

Hi i have a question regarding tax_amount, row_total, price_incl_tax and row_total_incl_tax.

My problem is that those values are caclulated as follow:

price = 30 
price_excl_tax = 25.08

so for ex: price_incl_tax should be 30, but it is 25.08... base_tax amount is good, it's calculated from price (30), but 开发者_JAVA百科tax_amount is calculated from price_excl_tax

Did someone encoutered this issue ?

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Ok, so it looks like it isn't problem with Magento itsefl, but with Thread Interference on PHP side.