I was practicing approaches using a D-1000 and noticed when I reviewed the approach for my local airport the valid date on the chart was showing Jul 19, 2018-Aug 18, 2018. I have the latest charts loaded on the USB according to the chart manager. Does anyone know why I would have green dots on the chart manager for the USB and it displays the date like that on the display? The current chart date is Jun 18, 2020-Jul 16, 2020 according to Air Nav.