Just chiming in as well that this bug has affected me in the same way others describe here. Ragged text in the regular note window, clear if the note is opened in a new separate window. Only applies with my monitor (if I view Evernote directly on my laptop screen the text is fine... doesn't help very much though since I only use the laptop screen occasionally).
For reference some technical info: macOS 10.13.6 on a MacBook Pro (2017), using a Dell U2412M monitor connected via a Thunderbolt to DisplayPort cable. Evernote is installed through the App store.
This has been going on for almost a month now with no fix... what's going on? I've ended up using Evernote a good bit less since this began, as it has become nearly unusable and hard on my eyes.