Sounds like you have a lovely tame flock of guineas! You're lucky they're so tame, they make the sweetest pets when they're hand raised. My 2 year old guineas still come running when they see me, and they even stopped liking cuddles by the time they were a month old.
If your guineas are less then 7-8 weeks old, they shouldn't be making the buckwheat noise. Search it up on YouTube, it is distinctly recognisable when you hear it. What you may be thinking is the buckwheating noise is what I call we-jip noise they make. When I first heard it, my keets were making it and they were only like 2 days old. I thought it was the start of buckwheat but I was wrong. I thought I had nearly all girls but it turned out I have more males. The buckwheat noise is like 100 times louder than the we-jip. We-jip is just a baby noise they make when they're happy. It is the baby equivalent to the beeps and soft boowee sound they make when they're adults.
How to tell if it's buckwheat or we-jip:
Buckwheat: hens make this noise once they are about 8 weeks old. It is the mating call they use to call they're boyfriend, their person mum or their sisters or friends. They lift their head up high, their tail on the ground and they yell really loud. They open their beak nice and big and the second syllable is higher pitch, longer and louder than the first. It sounds like buckWHEAT, buckWHEAT, buckWHEAT and so on. They buckwheat at a regular pace and it sounds like a kind of metronome.
We-jip: a happy noise baby keets make. Bothe gender keets make this noise until they're about 3 months old.(I think, don't quote me on the age they stop) Then they make adult happy noises instead like booweew and beep beep boowee and all their funny little trills. Baby keets we-jip when they're happy, they only open their beak a crack. They say it when they're eating, jumping, rubbing their chest on the edge of the brooder because they saw Mum, digging holes, running around with something yummy/interesting in their beak, and they tend to only say we-jip once at a time, though when they're really excited they may say it multiple times. We-jip sounds like be-chip or anything that is really quick and high pitched to say. The first syllable is higher pitch, longer and louder.
There's my comlex explanation of guinea fowl noises. I could write a report on all the noises guineas make!

