The are two diffeent DNS servers... The first is GTM (Not DNS Express or DNS cache service) but GTM module itself. The second is BIND runnning in Linux.
Looks like you first query worked, right? It return:
;; ANSWER SECTION:
test1.test.com. 0 IN CNAME test.test.com.
Whcih is valid response and which a real DNS server, unlike dig/nslookup, would know to requry to follow the aliases chain.
What is the probme you are trying to solve?
What version of BIGIP GTM is this?
There is a bug related to CNAME queries to wide_ips though... What exactly do you need to do, and why?