Chick smacking

[Brie6895]

My 3 week old buff orpington has started making a weird clicking/smacking noise. It's hard to explain but she's done it numerous times the times I've been in there today and last night while I was playing with them.
Does anyone know what I'm talking about or why it is happening?? I've seen her eating and drinking and running around like normal.
Here's a video

She does the noise twice near the end of the video.

 

[Brie6895]

Does anyone have any suggestions? I'm going to work tomorrow and I'm worried something might happen while I'm gone or maybe this is normal? She doesn't cheep that I notice so it this her new way of cheeping??

 

[Brie6895]

I also notice she doesn't chirp anymore does this mean she is just getting older and starts to make other noises. It kind of sounds like there might be mucus in her noise. But is this normal for a 3 week old not to cheep

 

[khoe]

Those sound kind of like angry peeps going on throughout the video, and it doesn't look like they have much food, mine like the holes really full. Could they be hungry?

 

[Brie6895]

No they constantly have food, this was after work when I got home. I refill it when I see its getting lower.
She's the only one not cheeping too

 

[khoe]

How old are they and what are the temps?

 

[Brie6895]

To update! She has been doing better i believe! I sat in there with them for 2 hours today and just watched with the door open as they went in and out. I saw her chirping a bit and noticed she was not making the weird noise hardly at all! Last night I added electrolytes to the water again, not sure if this has anything to do with it.
The oldest is around 3 weeks and the youngest is atleast 2 weeks old. I was never told the exact age so I just know the dates I purchased them and around about guess of how old they were when I got them. It is around 80 to 85 in there, but they seem to be happy with the temperature, sometimes they will sleep under the lamp and other times they are running around playing and eating