XML:original estimate value is altered on xml export

when you put in a time estimate like 4weeks 2 days, then export the jira issue to xml, the time estimate is transformed to a much smaller value like 1 week one day. I am attaching screenshot of the original reporter issue and the comments made by our in house developer. Please let me know if you already have this issue(I did do a search and didnt see it) and 2. if you would be fixing this in your core code.