Roots showing on the top of the soil

Hello guys, it is my 2nd grow. My plants are in the second week of flower. And I can see thin roots on the top of the soil. Is it a problem? Will they finish normally or I should transplant them? I will add some soil on the top ... They re in 3gal plastic containers, 6 week veg, growing healthy and strong. Thank you for answers.

If you have the room in the pot just top up the soil to cover them.

Is it a lot of them? I tend to get a few from the soil compacting

I wouldnt say a lot but not a few like 1 or 2, they re visible if you look closer, they are rly thin. I can feel that the top of the soil is ''harder'' when I stick my finger there when I check for moistness, like I can feel there are roots on the top.

Throw dirt on it and let it be. Personally I'd never transplant during flower

Okay, I dont want to transplant them during flower too tbh. I will definitely get a 5gal fabric pots next grow.