SharePoint import ruins create and modification dates

When exporting and importing data between SharePoint Server 2007 webs I found interesting bug - item creation and last modification dates will be lost during import. Example - document is created at 05.04.2008. After import I checked out data in manifest.xml. Everything seemed to be correct - also modification and creation dates of documents. After export these dates are incorrect. Instead of original dates I can see date and time of export instead of original dates. Dirty guy as I am I also sniffed around in SharePoint database - I saw correct dates there! But when looking my document library through browser I saw incorrect dates. Does anybody know what is the problem? Is it bug and is there any workaround to this problem?

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