Bows not dealing elemental damage

Hello, I saw oils effecting bows during the first boss fight and later infused my bow with a gem that gives thunder damage, it also did have the effect. I did wonder if it was working so I turned on damage numbers. My Dagger, which I infused with ice, showed 3 damage on hit and 1 blue for ice, after that my bow which also dealt 3 damage per shot, did not show any yellow numbers for thunder