I use Windows and iOS. Both have this problem. I don't have the "Simple Formatting" option to try on either one. I pasted a portion of an email to save the contact info and now everything from that point on is double spaced. I copied the entire note to the word processor, formatted it, deleted the note on Evernote and pasted the formatted note back in. The double spacing is still there, but not on the word processor. I use Evernote all the time and this, along with changing the font and style whenever it wants is starting to drive me crazy. I'm not a programmer, but it seems like it would be a simple fix.