when i check my site on intodns.com, it shows me errors regarding ns5.linode.com

under NS Category i get the following:
Missing nameservers reported by parent
FAIL: The following nameservers are listed at your nameservers as nameservers for your domain, but are not listed at the parent nameservers (see RFC2181 5.4.1). You need to make sure that these nameservers are working.If they are not working ok, you may have problems!
ns5.linode.com
and
Stealth NS records sent
Stealth NS records were sent:
ns5.linode.com

Any idea how to fix it, or why i get the error?

ns5.linode.com is listed by Linode's servers but is not listed with your domain name registrar. ns1.linode.com thru ns5.linode.com list themselves (i.e. ns1.linode.com thru ns5.linode.com) as authoritative DNS servers for your domain, but the root servers (which is where everyone looks to find out which DNS servers are authoritative for your domain and which get their information from your registrar) only list ns1.linode.com thru ns4.linode.com. Adding ns5.linode.com to the list held by your registrar will fix this.

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/ Peter