I'm 95+% certain that CO no longer has any 3-row 757s in its fleet. All but two of the 41 757-200s have been re-configured with the 4-row BusinessFirst cabin, the remaining 2 aircraft (with 6 rows of domestic F) will be reconfigured by the end of September (after the busy TATL summer season). All 757-300s (this is the part I'm not 100% on) have 6 rows of domestic F seats.

You can be sure that as soon as CO sorts out exactly what the equipment change will be on this particular flight, the seat map will be "corrected".