It's suggested to use CNAME for your "www" record. That's because when you change your domain's IP address, your "www" record will "change" it's IP address to the new one as well. If you are using A record for "www" record then you will have to change it as well which can be missed quite easily.
How to fix:
Right now you are using A record for your "www" record. Switch it to CNAME which points to your root domain.