Certified GKH Gardening Expert
I assume you mean that you used a Miracle Grow potting soil mix, along with some leaves.
This soil mix is generally used for potted plants or container gardens.
Leaves are beneficial in the garden, but generally should be composted properly and then added as organic material to the garden.
Yellowing leaves can indicate watering issues; too much or too little.
The plants are likely not getting enough nutrition from the planting material that you are using.
It is still early in the season to make adjustments to your raised bed and the soil you are using.
Here are some articles that will help you.