Sometimes when the ladder is locked they only lock the teams that have qualified for finals. This stops other teams from challenging them and allows them to play out finals matches.
In this case, the top 4 teams from the ladder qualified for the finals and thus have been locked on the ladder. This can be seen up the top of the ladder:
The top 4 teams cannot be challenged at present
Since the rest of the ladder did not make finals, they are allowed to continue to challenge and be challenged as them playing matches would not affect the outcome of the finals and thus it would be pointless for the whole ladder to be locked.
11 months ago