Where you're standing to take the second picture looking inside... Is there a large window there? Hopefully they'll figure it out soon, but they may not want to hang out in the coop if it's too hot. Do you have an ventilation in?
The ramp to the outside looks like it's at a good angle, but the little ramp on the inside looks a little bit too steep.
Do you have a few more bricks like what you have the water were sitting on? You could put them under the ramp on the inside to make it not as steep.
It’s only 50 degrees out and that picture of the inside of the coop is a big door for cleaning the coop I opened for the pic. My ventilation is between the roof and the walls