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It seems to be. See also https://getmusicbee.com/forum/index.php?topic=21495.0 It doesn't happen with any of the skins I tried except FlatUI (MusicBee 3, Midnight (Blue), Gunmetal (Dark-Fine Tuned), Thistle (Pastels)). I also noticed that with other skins, the player controls only appear when the mouse is over the popup. With the FlatUI skins, the controls are initially hidden until you mouse over the popup, and then they're stuck on -- even after you close and open the popup again. This happens independently of the text overlapping but you can see the play/pause icons are also overlapping here: I would have to guess both behaviors are part of the same issue.
Just looked at your code. Try moving NowPlayingPopup.Border & NowPlayingPopup.Body elements to the end of the code. Probably they have some conflicts with other elements at their current position.