622 is the Gregorian date for 1 AH.
There are also other problems with the range.
The type has ND (1466-1514) and 882 (1478) through 913 (1508) .
The summary range given is 882-913 (622-1514). The end points of the range don't match. The Hijri date of 913 at the end of the range corresponds to 1508.
The range in the years field should be 871-921 (1466-1514).
I think the root of the problem is that the ND dates are always AD, and aren't converted to AH for use in calculating the range of years in AH.