Hi I have the same issue.
I´ve reported this issue twice over 1 year and still haven´t recived any help on it.
Im using Evernote App on my Mac. 6.8 (453748 Direct)
These characters are being entered by pressing it´s representing button on the keyboard.
Se the following keyboard layout for my keyboard: https://en.wikipedia.org/wiki/QWERTY#Danish
I´m running the current version of the os: OS X EL Capitan 10.11.6 (15G31).
The issue starts after you have a good taglist.
Example, if you have as me a list of 50 tags starging on M and the next letter is A a