Weakness shown but no number?

[primetime34]

What does it mean if a card shows a weakness to a certain type but doesn't have a number next to that weakness type. So there isn't a +10, x2, or anything, just a symbol of a different type?

 

[PokePop]

For older cards, the weakness was always automatically "x2", so they never showed a number.

If you have an older card like that, treat it as "x2"