I am using 5.1 beta 2 (though I did notice this in the last beta as well) and when I seek to copy from NA27 to notes, the pasted text includes glosses. Example:
rel. whoὃν you (plural)ὑμεῖς notοὐκ to knowοἴδατε
This only occurs when copying into a note file. Having selected the text I want in the resource window, I use the context menu and from there click on "selection" and then "copy". However, if I paste into a document, it looks fine. Something's wrong here.