Switch to next round logic is dodgy

[glynnbird]

IF I choose a score for the last player (the rightmost player)
THEN the score is registered and the round indicator is moved to the next round.

This seems sensible, but if I select the wrong score, if I go back and correct it, it moves the round indicator on again. The rule should be "never move to the next round unless all the selectors in that row are complete".