The 1962 Night Series

The format was this:
all 8 League teams participated, as well as probationary teams Central District and Woodville between the 27th of March and 11th of April
Resulted as this:
Sturt d. Central
North d. South
Port d. Torrens
Glenelg d. Woodville
West d. Norwood
Semi Finals:
Port d. Sturt
West d. Glenelg
Final:
West d. Port
My question is, there were 5 first round winners, but only 4 progressed. Why did North not go through to the next round?
It couldn't be because they had the lowest winning score - Port did. Or the smallest winning margin - West did.
all 8 League teams participated, as well as probationary teams Central District and Woodville between the 27th of March and 11th of April
Resulted as this:
Sturt d. Central
North d. South
Port d. Torrens
Glenelg d. Woodville
West d. Norwood
Semi Finals:
Port d. Sturt
West d. Glenelg
Final:
West d. Port
My question is, there were 5 first round winners, but only 4 progressed. Why did North not go through to the next round?
It couldn't be because they had the lowest winning score - Port did. Or the smallest winning margin - West did.