I'm growing to really, really like Evernote but, as another user commented, Evernote's " failure to support plain text" is a major flaw. It's not a "feature request" to want "simplify formatting" to strip ALL of the formatting out of our notes. Only way re-pasting (and that's not a reasonable thing to need to do) works is with a brand new note. And, like some other users, I tried cleaning up the problem by pasting into an intermediary program (textedit), turning the copy into Plaintext, and pasting into Evernote. Same thing with space-V, as Emerick suggested. Tried CTRL/Command-SHIFT-V instead of CTRL/Command-V and I still end up with wide spacing. Some lines are "simplified" to single-spacing - others have a line inserted between.
Even when I "simplify formatting" it's not clearing the formatting consistently. I'm having the same experience, using the Mac desktop version 3.2.0 (premium). I consider these basic text editing issues, not features. It persists even when the bad lines are removed.
Deleting lines does not get rid of the bad formatting.
Copy & past fonts get upscaled & downscaled size at random. Line spaces double when I don't want them. Lots & lots of basic text editing problems.