Inconsistent glue for private name server DNS issue

>>>> domain name and ip's have been changed for confidentiality <<<<<<<

I have a domain - abc.com on a hosted web hosting company.

they said the name servers are 1.host.com (resolves to 1.1.1.1) and 2.host.com (resolves to 2.2.2.2).

I set up private name servers - 1.abc.com and 2.abc.com.

These name servers are in the SOA.  and there's a records for both hosts 1, 2 in the abc domain so when you ping 1.abc.com, it resolves to 1.1.1.1 and pinging 2.abc.com resolves to 2.2.2.2

things seem to be working and several DNS testing websites say things are OK.

But pingdom's test says there's errors:

Delegation
Inconsistent glue for name server 1.abc.com.

The address of a name server differed from the child and the parent. This is a configuration error and should be corrected as soon as possible.

Inconsistent glue for name server 2.abc.com.

The address of a name server differed from the child and the parent. This is a configuration error and should be corrected as soon as possible.

I googled that text and didn't come up with what to do.

Here's the details for the test from pingdom

Begin testing delegation for abc.com.
Name servers listed at parent: 1.abc.com,2.abc.com
Name servers listed at child: 1.abc.com,2.abc.com
No IPv6 name servers found.
Parent glue for abc.com found: 1.abc.com (1.1.1.1)
Parent glue for abc.com found: 2.abc.com (2.2.2.2)
Checking glue for 1.abc.com (1.1.1.1).
Inconsistent glue for name server 1.abc.com.
Checking glue for 2.abc.com (2.2.2.2).
Inconsistent glue for name server 2.abc.com.
Parent glue for abc.com found: 1.abc.com (1.1.1.1)
Parent glue for abc.com found: 2.abc.com (2.2.2.2)

any advice?