It’s always a good idea to wrap the divisor in a case when statement, thus avoiding dive by zero errors.
case when SUM(CountStatus.Calculated_CountStatusRecs) > 0 then
(SUM(CountEarly.Calculated_CountEarly) / SUM(CountStatus.Calculated_CountStatusRecs)) * 100
else 0 end
what values are displayed when you just display SUM(CountEarly.Calculated_CountEarly) and SUM(CountStatus.Calculated_CountStatusRecs)