Hmmm, clipboard copy! That has a very good chance of trying to be smart and to do text reformatting. I would definitely drag the entire control with all the data from one VI to the other, which should avoid Windows trying to be helpful. As a control, LabVIEW puts it in an application private format in the clipboard together with an image of the control. LabVIEW itself can pull the private format out of the clipboard, other applications will not understand that format and pull the image from the clipboard.
If you only select the text, LabVIEW will store it as normal ASCII text in the clipboard and Windows may try to do all kinds of things including trying to translate it to proper Windows text, which could replace all \r "characters" with \r\n and there is even the chance that the text goes through ASCII to UTF-16 and back to ASCII on the way through the clipboard and that is not always a fully 100% back and forth translation, even though they may look optically the same. Text encoding translations is a total pitta to fully understand.