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Are they Photos you have previously synced from Lr Desktop to Lr Mobile?
And thus are associated with your 'cloud' account already.
If you want your whole Catalog to be in Lr CC you'll have to Migrate.
You may NOT want to do this. There are many videos etc. for you to make the right choice.
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You want to be EXTREMELY careful in mixing Lightroom Classic and Lightroom CC. my advise is when checking out CC to NOT migrate your catalog especially if you have a lot of images. If you do, it will start syncing them all to the cloud killing your space on there and worse if you leave sync on in the classic lightroom, you will end up with multiple duplication of images. You should only migrate if you are really wanting to commit to the cloud world. Also if you have used Lightroom 2015/6 and are used to it, you need to know that Lightroom CC is NOT the logical evolution of Lightroom, it is a new product built from the ground up. You should think of it as Adobe bringing the iOS/Android versions of Lightroom to the desktop. The logical evolution of Lightroom 2015/6 is Lightroom Classic.
I would only recommend Lightroom CC to new users and to users that want a cloud solution next to a desktop solution and know what they are doing. Adobe should really have called Lightroom CC something completely different and not used Lightroom in the name.