This is good to know, because it is still doing it. In fact, it said I was on my phone on the app 5 hours ago. I was dead asleep 5 hours ago. :/
I have a similar problem. It says I haves three devices and it lists a device I have un-synced several times. It just told me I had used it on my phone 2 hours ago. I don’t even have the app on the phone. Unfortunately, Evernote only allows people to email them if they are paying customers so i won’t be able to use it at all soon because it says I’ll have to pay for it if I do it again.