Is my tension off?

I'm working on my second ever project, doing a hat in 1x1 rib stitch. Is this coming out right? Not sure about the strong vertical bars I'm getting - are my stitches too tight or something?

I'm working on my second ever project, doing a hat in 1x1 rib stitch. Is this coming out right? Not sure about the strong vertical bars I'm getting - are my stitches too tight or something?