Bind don't return DNS entries

Hello,

I've a strange problem with bind running on my SERVER_A.

On a remote server (SERVER_B), if I execute:

$ dig @SERVER_A domain.tld
I've no answer.

Now, I execute on my SERVER_A:

$ dig @127.0.0.1 domain.tld
I've an answer with the domain IP.

If now I re-execute on my SERVER_B:
$ dig @SERVER_A domain.tld
I've the domain IP returned.

I've tested on many subdomains or domains and I've the same problem : no answer before I execute a @127.0.0.1 dig query on the SERVER_A.

I've tried to restart Bind, to rndc reload. To rndc flush, but I've the same problem.

Do you have an idea please?

Thx

Ben