DNS not resolving for 1 of our clients domain

[CarlosOH_Mex]

Hi,

We have several domains set up in our parallels plesk panel. At first we used a Domain Name Server hosted on a different server (my.privatedns.com), but we have set up our own Name Server (dns1.caroltech.com.mx, dns2.caroltech.com.mx) and began using for almost all of our domains.

The problem is that the Name Server works fine for all our domains, except olimex.com.mx. The DNS settings for that domain are:

Host Record type Value
olimex.com.mx -------------------------- NS ------------------------ dns1.caroltech.com.mx
olimex.com.mx -------------------------- NS ------------------------ dns2.caroltech.com.mx
olimex.com.mx -------------------------- A ------------------------ 184.107.48.136

But this setup doesn't seem to be working. Can anyone tell me what we're doing wrong?

Thanks,

Carlos.