In some cases iTunes can fail to match a previously purchased and downloaded track in your library with its record of the past purchase, and then show two duplicate items, one of which has the cloud icon. If signing out of the store and signing in again hasn't resolved this then the next approach is to delete all copies of the affected tracks, allowing them to be hidden from the iTunes store, then unhide and redownload. You should then end up with the one copy and no cloud symbol, and the tracks would still be visible to stream to another computer or device that can access your cloud purchases, e.g. Apple TV.
See Hide and unhide iTunes Store, App Store, or iBooks Store purchases - Apple Support.
Both the iTunes Match and Apple Music services may complicate this picture a little.
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