Can anybody explain why I've get dashed line here?

I just followed a handstyle by . When I was ready, I wanted to make the line thicker. And the line is dashed and I cannot make it solid.

It's a group of 4 objects, I read in the only text on the screen that's in English*. Just ungroup, and you'll be able to change the stroke of all the lines at once.

(*Why isn't that in Swedish? Or is "Group of 4 objects" the only thing that's the same in Swedish and English?)

Thank you.