From day one my chicks coop was always on the ground with a good hard rain I had to raise there coop to keep them off the ground and out the water but now they done know to use the ramp or to fly up to get in how can I fix this? Below is the coop
How old are the birds in question? What is the spreading of the clays in the ramp? In the photo they look fairly widely spaced, but sometimes perspective is lost in photos.
You may need to add more steps on the ramp. You may also need to put them in a few nights in a row. When they have to figure out how to get out it can help them figure out how to get back in.
I would add more cleats (1-2 in each existing space) and then do some hand training showing them by placing them in the coop so they step out on the ramp to get out. Even if they only go part way and fly off they'll start to get the idea