Hello. I had the same issue all of a sudden today. I only use Evernote on my iphone and imac. Then today, my phone was identified as a second phone (and third device).
My devices were listed as:
imac
(my name)'s iphone
and current device (which was my iphone)
I've had this phone since 2018 and am on the same network as usual. I saw that there are posts in this forum describing the same issue in 2018. Here is a link to the 2018 thread:
I have revoked both phones (although it was the same phone, showing up twice) and changed my password as the linked thread indicates. Then I logged in again on my iphone and did not encounter the issue. I hope it doesn't pop up again.