Double Knockout roses
Many buds and flowering but lack leaves. Suggestions?
Give all of the rosebushes a feeding with a good well balanced organic rose food and keep them watered well. If the weather has turned hot where you are, it could be a natural thing that the rose drops some foliage and it does not grow back until the weather cools. Link to an article for you too: https://www.gardeningknowhow.com/ornamental/flowers/roses/leaves-falling-off-roses.htm