Footer link problem

Has anyone ever had problems with their footer links? The links seem to work half the time for a few of them. For example, my about page will be fine sometimes but there are times when I click it, that it redirects me to https://whisperingpineslawncare.com/about/www.whisperingpineslawncare.com/about/ instead of https://whisperingpineslawncare.com/about/. So I get an error which is obviously not good for my SEO. Any ideas what is happening? It happens to one or two of my other footer links at times too.