Line Feeds not displayed

Using user tag for text data.
I am unsure when text was copied or how but there are no line feeds displayed and text data is shown as one big block.
If that data text [user tag] is copied to text editor the line feeds are correctly displayed.
If text data is then copied back to the user tag it is correctly displayed.
Question - The source data in [user tag] must contain line feeds, as it shows when copied, but does not display line feeds.
Why ?????

Where do you see that behaviour? In a single-line input field? If so, you have to set it to multi-line - but this option is only available in the tag panel.
Or you look at the data in the extended tags dialogue (Alt-T) in the edit dialogue for that field.