From an online forum, with the OP asking “Why is the “Hershey’s N’ More Caramel” candy bar not Kosher?”:
This is just a guess:
If you check out Hershey’s Kashrus page (yes, they have one), you’ll see that all three items in the “Hershey’s ‘N More” line are not kosher. One of those items is Hershey’s ‘N More Marshmellow. Marshmellow is a very tricky item, kashrus wise. It’s entirely possible that the other two Hersheys ‘N More products are produced on the same equipment as the Marshmellow product, making the other two items not kosher.