BIND records on F5 GTM is not working until I configure DNS Express.

BIND records on F5 GTM is not working until I configure DNS Express. The issue lies when we migrated several domains, for example: We have a zone abc.com and we migrated the registrat to point to the F5 GTM the resource records on abc.com isn't resolving. It got resolved when we configured DNS express for that domain. Was that the correct behavior?