The apparent 7.9 version is actually the iOS version. The Mac available on the Evernote site is still 6.3 and one would never expect a version change from 6.3 to 7.9, maybe 6.3 to 7.0.
If you believe it's an error, do like I did on apps I have found they had wrong data. This happens probably because both versions of Evernote have the same name. However, access the Evernote's application page at Mac Informer and use the Suggest a correction link. It's the easiest way to correct the data for other users as well.