Why does barbell feel easier than dumbbell?

Question

After 4 months, I recently went from 7.5kg dumbbells to 10kg dumbbells and it feels really heavy whenever I lift above my chest level. like my shoulders and back have a hard time doing the exercises. But 2 days ago I bought a barbell and loaded it with 28 kgs I was comfortably ( little bit challenging) able to do my exercises. I dont understand why the dumbbells feel so difficult to work with.

In: 30

Answer 1

Wierd, im the opposite. Dumbell press 45kg each for reps but throw 2 plates on a bar and i feel weak like 1rm