I have the same problem with the latest Evernote Windows client and latest Android client. Thus, for instance, when I pull up a note created on desktop/web that's already tagged and edit it on Android, it clears all the tags that were already associated with it. This makes editing notes (e.g. grocery lists) totally impractical on Android because I'll lose whatever tagging I've already done. Note that even after editing and retagging a note in the Android client, the next time I pull up that same note on Android there are no tags displayed.