^^^ when you say "molehills"..are you talking about the large cones of dirt instead of the raised tunnels that don't break the sod?
If so...those are star-nosed moles which are much harder to trap. The ones that just raise the sod up are easy to trap because they use the same route over and over.
Here's a pic of a star-nosed....(much bigger mole)
normal eastern mole...
