Been looking at flights in first 10 days of November for a 14 day trip,looking at best pricing for cars on set cheaper us air flight days also,but noticed something very strange on the seat map on us airways.com

Rows 1-5 are envoy as expected,but go onto economy and only shows rows 8-39,rows 6 and 7 are missing - row 6 being a bulkhead and always blocked off anyways but always used to show on the site,the amount of rows for the plane is correct just missing the 2 mentioned rows

anyone any ideas whats going on with this and whether row 10 on Airbus 333 is still the row without a window,just has a blank instead