Update issues

The Creative Cloud app on my Mac tells me that my version of Lightroom is up to date.  However, when I'm in the Lightroom app it says that it can't support edits to DNG photos that have either been uploaded from mobile or updated on the web platform.  For these photos the app says "This photo was edited in a newer version of Lightroom.  Editting it further without updating Lightroom will cause incompatible edits to be lost."  My Lightroom was purchased on the app store and is part of a payment plan where I pay every month.  How can I get Lightroom to update if Creative Cloud and the ap store say its up to date? (This system info says the Lightroom version is 5.5 and I really don't think that is the most recent).