New user here, but can't find my answers anywhere.

Looking on the SD chart, I see the wind aloft overlay which if I long press on, tells me that the 2000ft wind is 271/10. However, on my plog, (for a 15min leg that starts at one wind aloft overlay symbol and ends at another with a similar wind reading), the pilot log is giving the wind as 057/4 for a 2000ft cruise. Which is almost exactly the opposite wind with half the speed.

Just wondering why that is. Thanks.