Are my bees hungry?

This is my first winter with my 3 hives in Zone 6a, NH. I have Apimaye hives and left the internal top feeder in place all winter. The hives have a middle compartment for winter food, and I put sugar blocks in them back in December. I took the cover off to add more food today (45 and sunny) and I saw all the bees clustered in the compartment where the winter patties would go. They looked frantic, maybe hungry? Anyway, I didnt add more food because they were all crammed into the compartment and I didnt want to disturb the cluster by opening it up. Is there anything I can do to help them through these last couple weeks of freezing temps? I felt like if I tried to open the compartment, I would squish the bees or cause them to fly off and freeze.