I searched your domain and it looks like you have set it to ns1, ns2, ns3, ns4 depending what you look at.
It looks to me that you need to go to your registrar and point it to dns3 and dns4. My search reports the registrar have set it to ns1 and ns2.
Alternatively, open a help desk ticket and ask the techs to have a look so nothing is wrong at the TCH end.
And welcome back to TCH.