As you wrote you filled the tag-field UNSYNCEDLYRICS. As the word says the lyrics you put in there are not synchronizeded and not meant to show scrolling along when you play a song.
If your Player is able to do you anyway can show them at a whole.
"eng||" is at the beginning and shows the language. MP3Tag shows this but you don't have to care about it because other software that is able to show the lyrics doesn't show it. Answay it has to be in there.
What you are looking for ist the tag-frame SYLT (Synchronized Lyrics). This tag-frame is not supported by MP3Tag. To embed them in your MP3s you need other software, i.e.
https://www.compuphase.com/software_sylteditor.htm
http://www.crintsoft.com/MiniLyrics.php
Note that to have synchronized lyrics it is not enough to have the lyrics-text. The tag-field also needs to have information for synchronizing with the music. That means that if you don't embed already prepared lyrics its up to you to edit the sync-informations before embedding the lyrics.