Targeted Dispel - "compare that to the spell with highest caster level" now if all spells on the target is cast by the same caster they have the same casterlevel - but diffent spelllevels.
So is this something new in parthfinder or just mistake?
Ive ran into the same problem. I just randomize the first spell affected. However, since it is just one dispel check if it doesn't work on the first spell it wont work on any spell (if they all have the same caster level). - Gauss