When you add a license, you have the option of applying the license as additional devices or as a renewal. It looks like you added three of your licenses as renewals. As a result, you extended the expiration date of your one device rather than adding more devices to your network.
You get a brief period when you can "undo" your license addition, which will let you correct the operation. That's why your screenshot has a circular arrow next to one of the licenses. If you don't have the "undo" option, you're going to have to contact Meraki support.