probably not gatekeeper. the question i have for you though is what kind of jasmine are they? if they are the white, very fragrant, star or confederate jasmine or star jasmine, they aren't getting enough sun. even my carolina jessamine (which is not true jasmine, but is often called jasmine) gets filtered sunlight all day and blooms best if it is in full or afternoon sun. hope this helps.
by the way, star/confederate jasmine will bloom in
zone 10, where i have lived before, which is why i said probably not the heat.