Chicks not interested in heat at night?

[kimscrew]

2 Easter Eggers and 2 bantams, 4 weeks old tomorrow. I moved the brooder outside a week ago and they are doing great. They've had the same heat plate since I got them and used it fine until 2 nights ago I went out to check them at 10pm and they were huddled in the corner not under the plate. I thought it might be too warm so I raised it up a few clicks. Last night, 10pm they were huddled in the corner again. I put them under the heat plate and they stayed until I left, after that I'm not sure.

Should I raise it up again? Not worry about it?
They are not peeping loudly and seem happy and active. Eating and drinking great.

 

[Chick-N-Fun]

I would raise it and let it be. I’m sure at 4 weeks they are feathering out and need less heat......
As long as they are eating, drinking and pooping, they should be fine.
Best wishes and be well!