MD-11 FCOM typo?

Hey guys,I must say what a fantastic aircraft you have made! It's like nothing I have ever flown before. I've been doing a lot of reading to learn how this aircraft works and was looking at page 420 of the FCOM.I noticed that with flaps 50 and a landing weight of 460000lbs S.L STD 15c the amount of runway required was 4410ft without adding on any wind components. Looking at 480000lbs at the same type of environment runway required 1550ft and 500000lbs 4720.Is this correct? It seems a little strange to me but I may be wrong.Thanks,Billy