Yup, should be a simple fix. Your links are broken because they are doubled... take a look at the link for your comments
So we look at settings->general first to make sure they look right, both should probably be
Next, what do you have set up in your settings->permalinks settings? Did you just pick one of the standards, or did you try to do something custom?
You can try setting those back to default first, and test your site. If it's good, go back to a custom permalink setting