u/FallenPopcorn-12

Hi all, I've removed wallpaper, washed the walls to get remaining glue off, sanded the walls and now started applying wall primer but it's caused these bumps. Is this normal? Is there something I've missed that's causing this? I'm wondering if there was something left on the wall or if it's meant to do this. If I carry on with a few layers and then paint, will it be okay?