I found out that the changing point numbers is due to the introduction
of dynamic labels. However, I am still observing a bug in this feature
because the labels are only changing for the upper half of the board and
the lower half remains unchanged. I searched the change log and found
that dynamic labels where introduced on July 27 2003 by Joern. Ever
since this feature hasn't been altered anymore so I'm suspecting that
either this bug has remained unknown, or I'm misunderstanding the
correct implication of the feature.