Leaves On Calibrachoa are curled
What would cause the leaves of my Calibrachoa bells to curl?
There are many reasons why leaves may curl - disease; insects; water, light or temperature stress - but the first line of defense always remains the same - good culture to create strong plants. This article will give you a checklist for your million bells: https://www.gardeningknowhow.com/ornamental/flowers/million-bells/calibrachoa-million-bells.htm
If you can't come to any conclusions, you could send us some pictures, or you could take some plant samples to the extension service (assuming you're in the US) where they will be able to diagnose problems. This link will help you find the nearest office: