if
raid frames grow up
each raid group is set relative position to previous group
then
only first group is anchored at bottom
each next group is anchored to top of the previous

that means if there is less people in first group, then the top of grp1 is lower = whole grp2 is lower and same the rest

probably duplicate of #921

This is a bug on a fresh install. To work around it change the growth direction into something else and then change it back, adjust positions after that and it should behave as expected.