Do effects like Fire Storm that let you create multiple areas with the spell, can you overlap them and have the spell hit the same area multiple times?
Similarly, would something like the
As a general rule, an effect only influences a target once per use barring special rules or explanation. So even if you were to overlap areas the effect wouldn't hit repeatedly. You essentially are "wasting" the effect if you overlap them.
There are rules about spell stacking in the core book that might shed some light on it for you.