cPanel DNS cluster setup only root sync

i have setup a third dns server with clustering option in whm with the root account
every thing works when i do a dns change i get this message

Bind reloading on frankfurt using rndc zone: [*****.nl]
Bind reloading on london using rndc zone: [******.nl]

but when i login with a reseller account and do a dns change i only see

Bind reloading on frankfurt using rndc zone: [*****.nl]

no london.

what have i forgotten to do? Right? Where?

regards,

bram