You can fix that, it's just like Drajor said, except not necessarily exactly what he said, without this being true, clients HP will stop at a random percentage due to the proper calculations not being used. Just run the query below, and set it from 'false' to 'true', or use Rencro's query.
Code:
SELECT * FROM rule_values WHERE rule_values.rule_name LIKE 'Character:SoDClientUseSoDHPManaEnd';